Biosecurity
生物安全
🗣️ 情景例句
It smells so delicious.
它闻起来好香。
Is it direct train?
这是直达车吗？
It has never been explained why university students seem to enjoy practical jokes more than else.
谁也弄不清为什么大学生好像比任何人都更喜欢恶作剧。