Also, in the query [dura ace track bb axle njs] the “bb” is probably referring to a bottom bracket while in the query [software update on bb color id] the “bb” probably means blackberry.

而且，在查询dura ace track bb axle njs时，"bb"指的应该是底架（bottom bracket），而在查询software update on bb color id时，这里的bb说的应该是黑莓手机（blackberry）。

youdao

When the guiding track framework is joined to 10m, you should make vertical of guiding track framework's axle and the base from the front and side.

导轨架接高到10米时，需用丝线坠从正面和侧面分别找正导轨架轴线与底座平面的垂直度。

youdao

Loading of trains is a complex issue. It involves many factors such as the axle weight, suspension system, traveling speed, track structure, geometric irregularity of lines and so on.

列车荷载是一个很复杂的问题，同时涉及列车轴重、悬挂体系、行车速度、轨道组成、线路平顺等等因素。

youdao

The fat outer tire can be moved in and out on the axle before the race to achieve maximum cornering power for track conditions.

FORBES: Vroom!