level signal的用法和樣例：
例句
- Also, their isolation is limited by the leakage currents of the semiconductor devices, and they have a high insertion loss for low level signals.
此外，其隔離受半導體器件漏流的限制，並且對低電平信號具有較高的插入損耗。 - When the pest crawls through the electro-optical sensor, it will produce a high level signals and begins to count the pulse signal, the count to the pest's number can be realized.
當蟲子通過光電感測器時，光電感測器輸出高電平信號對脈衝信號進行計數，就實現了對蟲子數量的統計。
