Perfect elastic collision
[化] 完全弹性碰撞
🧩 词语组成解析
🗣️ 情景例句
You know,maybe I'll put together some photos of Grandpa as a welcome present.
我说，或许我把爷爷的一些照片组合起来，作为欢迎他的一份礼物。
It is one thing to speak much and another to speak pertinently.
话讲得多是一回事，讲得恰当是另一回事。
The cave led back into the rockface and the earth by the entrance was dry.
岩洞迂回延伸到岩面里，靠近洞口的土是干的。