Viras
核黄素四丁酯
🗣️ 情景例句
I don't know how she does it.
我不知道她怎么办到的。
Please call me if you have any problems.
如果你有难题，就请打电话给我吧。
However, rescue operations are proving difficult.
然而，事实证明营救工作非常困难。