Serums
浆液, 血清
🗣️ 情景例句
I don't know if I can get to sleep.
我不知道我能否睡得着。
I have to go now.
我必须走了
Although mankind has undergone no general improvement in intelligence or morality, it has made extraordinary progress in the accumulation of knowledge.
虽然人类有智力和道德上没有得到普遍提高，但在知识积累方面却取得了巨大的进步。