Gerontologist
其它 Other[医] 老年病学家
🗣️ 情景例句
Typing is easy once you get the hang of it.
一旦你掌握诀窍，打字就很简单。
It's my treat this time.
这次我请客！
is an unfortunate victim of adverse circumstances,
是逆境的牺牲品，