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透镜式色灯信号机采用直丝双灯丝信号灯泡。

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ZD6-A型转辙机的减速器由两级组成,第二级为行星传动式减速器,减速比为41:1。

In the example, the coach said “we didn’t play well today”. What is implied? It means “ .”

企业的营销目标是对行动的承诺,是抽象的。

Once you whisper the password, the fat lady ______ (reveal) the entrance to the common room.

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