n. (通过警戒线等时使用的)口令;通行字;保密字;获准进入的手段 [参较 countersign]
🗣️ 情景例句
About what?
关于什么
I think a joint venture would be beneficial to us both.
我认为合资经营对双方都是有利的。
Those planning a trip to remote areas, or intending to live in countries where drinking water is not readily available, should know about the various possible methods for making water safe.