Ifdef
n. 如果定义了
🗣️ 情景例句
Oh, Grandpa will be so pleased that you're wearing them.
噢 ，戴了它， 祖父一定会非常高兴。
It is madness for a sheep to treat of peace with a wolf.
跟狼讲和平，此羊必癫狂。
Who's calling?
是哪一位？