Thetis
n. [希臘神話]西蒂斯（海神Nereus的女兒）
??? 情景例句
He is in a good mood.
他的心情很好。
Don't be so sure.
話別說得太滿。
This decline in vigour with the passing of time is called ageing.
生命力隨時(shí)間的流失而衰退叫做衰老。