Prr
n. pulse-repetition rate的简写
🗣️ 情景例句
We haven't heard from him for weeks but we're still hoping for a letter.
我们已经有几个星期没有他的消息，但仍然盼望着他的来信。
When the tree is fallen, every one runs to it with his axe.
大树一倒下，人人持斧来。
You can buy whatever you need if you have enough money.
钱多了，你需要什么就可以买什么。