The phone was perched precariously on the window ledge.
电话放在窗台
，
欲坠。
The phone was perched precariously on the window ledge.
电话放在窗台，欲坠。
The climbers rested on a sheltered ledge jutting out from the cliff.
登山者在悬崖
岩棚休息。
If the emitter ledge is too thick, current will flow through the undepleted ledge, which increases the emitter-size effect.
不适当射极突出部厚度，将会在射极突出部侧壁造成严重表面复合。
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