Ifdef
n. 如果定义了
🗣️ 情景例句
At today's exercise class...
今天上健身课的时候……
Did you go to the zoo this morning?
你今早去动物园了吗？
the most destructive effects have come not from physical weapons but from ideas.
破坏作用最大的不是杀人的武器，而是思想。