Corrugations
n. 起皱；皱状；灌水沟；波纹成形
🗣️ 情景例句
Aren't you going to the aerobics class this morning?
今天上午你不是去上有氧运动课吗？
That depends.
那要看情形了。
The IBM Personal Computer was widely copied.
IBM的个人电脑被大规模地模仿。