The dead center, being a stationary bearing point, must be lubricated.
由于是固定的支承点，死顶尖必须润滑。
Most people know electricity standing still is no more useful than is a stationary belt between a steam engine and a machine to be driven.
大多数人认为，停滞不动的电并不比架设在蒸汽机和要被传动的机器之间的固定带更有用。
An astronaut will attempt to leave the stationary spaceship and then return to it.
一名宇航员试着离开静止不动的宇宙飞船，然后再返回。
