Sepsometer
空气有机质测定计
🗣️ 情景例句
autograph copies for the guests at the opening?
在展览开幕时为客人在书上亲笔签名呢
Young man may die but old men must die.
年轻人可能会死，老年人难免不亡。
It is no use learning without thinking.
学而不思则惘。