Ifndef
如果未定义
🗣️ 情景例句
The original plan by the council
会议原有的计划
That's all for today.
今天就到这儿了。
She intended to dress up as a ghost and as she had made her costume the night before,
她打算装扮成鬼的模样。头天晚上她已把化装服做好，