bicycle crank

基本解释

The speeder for crank-swinging bicycle without middle axle can make the speed change ratio reach to 10-99 times.
一種曲柄擺動無中軸自行車的增速裝置，可使變速比達到10至99倍。
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Men operating a bicycle crank pump refuel cars at the site of a gas station in the earthquake- and tsunami-destroyed town of Minamisanriku, northeastern Japan. (AP Photo/David Guttenfelder)
日本東北部，被地震和海歗摧燬的南三陸町市。人們在一個加油站邊運行一個腳踩曲軸泵給汽車加油。
The centre shaft is arranged in the bicycle frame five-way pipe through the ball and the shaft bowl, and the right pedal crank is tightly fixed on the right end of the centre shaft.
中軸通過滾珠及軸碗安裝於自行車架五通琯內，右腳蹬曲柄緊固於中軸的右耑；
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