switch closed up的意思|示意
美 / switʃ kləʊzd ʌp /
英 / swɪtʃ klozd ʌp /
道岔封锁
switch closed up相关例句
The circuit is wired so that it is powered up only when the car's ignition switch is closed.
该电路是有线，使其通电只有当汽车的点火开关已关闭。
Suppose the switch in the diagram is suddenly closed in the "up" position.
假设图中的开关突然闭合到“上”方。