Std.
[医] 皮肤试验剂量
🗣️ 情景例句
If you educate the public about dangerous diseases they can protect themselves, which will help to halt the spread.
如果你能教育公众如何来防治危险疾病，他们就能够保护好他们自己，从而阻止疾病的传播。
No man can do two things at once.
心无二用。
It is good to learn to work with others in a team.
学会在一个集体里与其他人一道工作是有益的。