Subtherapeutic
adj. 亚治疗的，（医药、维生素等）未达治疗剂量的，（尤指饲养鸡等中使用）预防性剂量的
🗣️ 情景例句
Come in, please.
请进。
I wrote to him last Friday.
我上个星期五写信给他。
Why do you keep asking me the same question?
你怎么又问我同样的问题？