single knife switch

例句：

1. 1. Thenew car has a single-knife switch for the engine.
   新车有一个用于引擎的单刀开关。
2. 2. Theold house had a single-knife switch inthe kitchen.
   旧房子厨房里有一把单刀开关。
3. 3. The engineer found the single-knife switch and turned itoff.
   工程师找到了单刀开关并关掉了它。