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freewheel    
n. 自由飞轮
vi. 轻松快活地行动,凭惯性前进

自由飞轮轻松快活地行动,凭惯性前进

freewheel
n 1: a clutch (as on the rear wheel of a bicycle) that allows
wheels to turn freely (as in coasting)
v 1: live unhurriedly, irresponsibly, or freely; "My son drifted
around for years in California before going to law school"
[synonym: {freewheel}, {drift}]
2: coast in a vehicle using the freewheel

Freewheel \Free"wheel`\, v. i.
1.
(a) Of a freewheel cycle, to run on while the pedals are
held still.
(b) Of a person, to ride a cycle of this manner; to coast
in a vehicle having a freewheel. To ride a freewheel
cycle. [WordNet sense 2]
[Webster 1913 Suppl.]

2. (Mach.) To operate like a freewheel, so that one part
moves freely over another which normally moves with it; --
said of a clutch.
[Webster 1913 Suppl.]

3. To act without controls, external or internal; to live
freely, independently, and without concern; -- of people.
[WordNet sense 1]
[PJC]


Freewheel \Free"wheel`\, n. (Mach.)
A clutch fitted in the rear hub of a cycle, which engages the
rear sprocket with the rear wheel when the pedals are rotated
forwards, but permits the rear wheel to run on free from the
rear sprocket when the pedals are stopped or rotated
backwards. Freewheelcycles are usually fitted with hub brakes
or rim brakes, operated by back pedaling.
[Webster 1913 Suppl.]


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  • Human digestive system | Description, Parts, Functions | Britannica
    The human digestive system is the series of structures and organs through which food and liquids pass during their processing into forms that can be absorbed into the bloodstream
  • Gastrointestinal tract | Definition, Organs, Diagram, Facts | Britannica
    Gastrointestinal tract, pathway by which food enters the body and solid wastes are expelled The gastrointestinal tract includes the mouth, pharynx, esophagus, stomach, small intestine, large intestine, and anus
  • digestive system - Kids | Britannica Kids | Homework Help
    The digestive tract begins with the mouth and ends at the anus The main organs of the digestive system are the mouth, the pharynx, the esophagus, the stomach, and the small and large intestines The liver, the gall bladder, and the pancreas also help in the process of digestion They produce substances that break food down into simpler forms
  • Human digestive system - Proteins, Enzymes, Absorption | Britannica
    Human digestive system - Proteins, Enzymes, Absorption: The digestion of protein entails breaking the complex molecule first into peptides, each having a number of amino acids, and second into individual amino acids The pepsins are enzymes secreted by the stomach in the presence of acid that breaks down proteins (proteolysis) The pepsins account for about 10 to 15 percent of protein digestion They are most active in the first hour of digestion, and their ability to break down protein is
  • Human digestive system - Rectum, Anus, Digestion | Britannica
    Human digestive system - Rectum, Anus, Digestion: The rectum, which is a continuation of the sigmoid colon, begins in front of the midsacrum (the sacrum is the triangular bone near the base of the spine and between the two hipbones) It ends in a dilated portion called the rectal ampulla, which in front is in contact with the rear surface of the prostate in the male and with the posterior vaginal wall in the female Posteriorly, the rectal ampulla is in front of the tip of the coccyx (the
  • Human digestive system - Organs, Processes, Functions | Britannica
    Human digestive system - Organs, Processes, Functions: The liver lies under the lower right rib cage and occupies much of the upper right quadrant of the abdomen, with a portion extending into the upper left quadrant The organ weighs from 1 2 to 1 6 kg (2 6 to 3 5 pounds) and is somewhat larger in men than in women Its greatest horizontal measurement ranges from 20 to 22 cm (approximately 8 inches); vertically, it extends 15 to 18 cm, and in thickness it ranges from 10 to 13 cm The liver
  • Human digestive system - Esophagus, Stomach, Intestines | Britannica
    Human digestive system - Esophagus, Stomach, Intestines: The esophagus, which passes food from the pharynx to the stomach, is about 25 cm (10 inches) in length; the width varies from 1 5 to 2 cm (about 1 inch) The esophagus lies behind the trachea and heart and in front of the spinal column; it passes through the diaphragm before entering the stomach The esophagus contains four layers—the mucosa, submucosa, muscularis, and tunica adventitia The mucosa is made up of stratified squamous
  • Human digestive system - Gastric Secretion, Digestive Process, Nutrient . . .
    Human digestive system - Gastric Secretion, Digestive Process, Nutrient Absorption: The gastric mucosa secretes 1 2 to 1 5 litres of gastric juice per day Gastric juice renders food particles soluble, initiates digestion (particularly of proteins), and converts the gastric contents to a semiliquid mass called chyme, thus preparing it for further digestion in the small intestine Gastric juice is a variable mixture of water, hydrochloric acid, electrolytes (sodium, potassium, calcium
  • Definition, Function, Structure, Diagram, Facts - Britannica
    Stomach, saclike expansion of the digestive system, between the esophagus and the small intestine; it is located in the anterior portion of the abdominal cavity in most vertebrates The stomach serves as a temporary receptacle for the storage and mechanical distribution of food before it is passed into the intestine





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