That's why polystyrene is ideal for use in bicycle helmets and other protective gear.
这也是为什么聚苯乙烯是制作自行车头盔以及其他保护装置的理想材料的原因。
In July Toyota unveiled a concept bicycle, the PXP, with a thought-controlled gear-shift mechanism.
七月份丰田首次发布了一款概念自行车PXP，它带有一个思维控制的传动移位机械装置。
Applications Top piece of shoe heels, parts of bicycle, sporting equipments, gear.
天皮、脚踏车配件、运动器材、齿轮。
A fixed-gear bike is a bicycle whose pedals rotate at all times, even when coasting.
固定齿轮自行车是一种需要人一直不停地踩的自行车，即使在滑行时也要一直踩。
The bicycle driving shaft is provided with an electricity generating gear box.
在自行车驱动轴上设置一个发电齿轮箱。
When the back wheel of the bicycle is rotated, it drives the drive gear and then forces the centrifugal pump to operate and pump water.
当自行车后轮转动时，带动传动齿轮并驱动了离心泵运转抽水。
Sam cleans the gear wheels and finds that afterwards his bicycle works perfectly.
山姆清洗链轮后发现他的自行车能够运转自如了。
A rain cover for a faucet of an electric bicycle relates to a rain gear.
一种电动自行车龙头防雨罩，涉及一种雨具。
A rain cover for a faucet of an electric bicycle relates to a rain gear.
一种电动自行车龙头防雨罩，涉及一种雨具。
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