Diac
两端交流开关元件
🗣️ 情景例句
OK.
好的。
I took off my raincoat.
我脱下了我的雨衣。
and so the tools of long ago have remained when even the bones of the men who made them have disappeared without trace.
因此，尽管制造这些工具的人的骨头早已荡然无存，但远古时代的石头工具却保存了下来。