Gravis
[医]重的，剧烈的
🗣️ 情景例句
How many courses are you taking this semester?
这学期你选了多少课？
It's been 5 years since I last saw you.
我已5年没见你了
the varieties are infinite; but two classes may be roughly seen.
鸟的飞行方式千差万别，但大体上可分为两类。