Std.
[医] 皮肤试验剂量
🗣️ 情景例句
Normally I go to bed at about ten o'clock.
通常我在 10:00 睡觉。
This is a poem about frontier life in the United States.
这是关于在美国的边疆生活的一首诗。
The bridge has been washed away by the floods.
桥已经被洪水冲走了。