Ifdef
n. 如果定义了
🗣️ 情景例句
I hope so.
我希望如此。
This time didn't count. Do it over!
这次不算，重来！
In the early 1980s, the computer giant, IBM produced the world's first Personal Computer.
80年代初，计算机行业的王牌公司美国国际商用机器公司（IBM）生产出了世界上第一台个人电脑。