在这些情况下氮不会是可用的对于同其他元素结合，为了形成化合物和形成生命的建筑模块的链条。
Under these conditions the nitrogen would not be available to bond with other elements in order to form the compounds and chains that form the building blocks of life.
这一跨越可能由链条驱动的发明带来，这种驱动中每踏一下都会注入更多活力。
The leap was made possible by the invention of the chain-drive, which generated more oomph for every pedal push.
在奇数齿情况下，链轮转二圈，使每个齿与链条啮合一次，这样延长了链轮寿命。
In case of odd number of teeth, each tooth of the sprocket meshes with the chain per two turns of the sprocket, thus extending service life of the sprocket.
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