Std.
[医] 皮肤试验剂量
🗣️ 情景例句
My vacation was too short, I needed more time.
假期太短了，再有几天就好了。
Today, I'd like to show you something which I'm sure you'll find interesting.
今天我要向你们展示一些东西，我相信你们会感兴趣的。
That's a big box. Is it heavy? Please let me help you.
这是个大盒子。重吗？让我来帮你。