Nullcheck
空检查
🗣️ 情景例句
It's hard for some older people to take all that noise.
一些老年人没办法忍受那些噪音。
The more riches a fool hath, the greater fool he is.
愚人越富越愚蠢。
You'll save time not waiting for the elevator.
你可以节省等电梯的时间。