Ifdef
n. 如果定义了
🗣️ 情景例句
I didn't quite catch your name.
对不起，我没听清楚你的名字。
This problem is hard to solve.
要解决这个问题不简单。
My plane leaves at seven, so I think we'll take a taxi.
飞机7:00起飞，因此我想我们得乘出租车去。