The axle sleeve is then greased, and the new tire is slid smoothly on.

在上涂上润滑油，然后把新的胎滑上去。

A sleeve protects the axle, and a lifting tool pulls the tire off.

用一个套筒保护，然后用重工具把胎卸下来。

So a hand pushing an object, sea sauce, scissors, or a wheel axle are all examples of first-class levers.

因此，推动物体的手、海酱、剪刀是一级杠杆的例子。

With the push of a button, the twin turboshaft engines roared to life.

按下按钮，双涡发动机轰鸣来。

If you put heavy stuff close to the axis of symmetry, or close to the wheel axis, then it's stable, too.

“如果你把重物放在箱子对称附近，那行李箱也会稳定。”

The helicopter is powered by two Turbomeca Makila 2A1 turboshaft engines located above the cabin.

该直升机由位于机舱上方的两台透博梅卡 Makila 2A1 涡发动机提供动力。

He reasoned that as the wheels spun, the mercury would flow to the bottom of each reservoir, leaving one side of the wheel perpetually heavier than the other.

他这样解释，随着转动，水银会顺着流向每个储液槽的底部，这样会使滚的一边永远比另一边重。

The CH-47 is propelled by two Lycoming T55 turboshaft engines, one on each side of the helicopter's rear pylon, connected to the rotors by drive shafts.

CH-47 由两台莱康明 T55 涡发动机驱动，直升机后挂架两侧各一台，通过传动与旋翼连接。

The four wheels were under the panels, and the axles of the wheels were attached to the stand. The diameter of each wheel was a cubit and a half.

四个子在心子以下，与座相连，每高一肘半。

The wheel and axle is made up of a circular frame that revolves around a shaft or rod — a device that, in its earliest forms, was probably used for lifting water buckets from wells.

是由一个围绕杆旋转的圆形框架组成的——这种装置在其最早的形式中，可能用于从井中提水桶。