Optical subsytem
[计] 光学子系统
🧩 词语组成解析
🗣️ 情景例句
I hate to bring this up, but this is a nonsmoking zone.
对不起提醒一下，这儿是禁烟区。
If he doesn't pay him, I will.
如果他不，我将付给他。
There is a boat in the river.
小河里有一条船。