Undular
a. [物](水跃)波形的
🗣️ 情景例句
The mall's packed today.
今天商场里的人很多。
A fall into the pit, a gain in your wit.
吃一堑，长一智。
But there was no time to think.All her other friends were now outside the door.
但来不及去想了。其余的朋友现在也全都到门外了。