Baur
n. biologically active ultraviolet radiation 具有生物活性的紫外辐射
🗣️ 情景例句
Here's $ 1000 for the trip. Use some of it for stamps.
这里是1000美元，给你当旅费。要把一些用来买邮票啊！
Do you usually do arithmetic on Sunday?
你通常在星期日做算术吗？
I would like to ask you a favor.
我可以提出一个要求吗？