Castes
n. 印度的社会等级( caste的复数形式 ); 任何排他的社会阶层; 种姓（按照血统、阶级、财富等严格区分的社会制度）
🗣️ 情景例句
Well ... I feel fine about it. Why shouldn't I?
嗯……我觉得不错。为什么不呢？
Why are you so scared? I don't bite.
我又不咬人，干嘛那么怕我？
The currents of air that the walls of the ship direct upwards, as well as in the line of its course, are enough to give the great bird with its immense wings sufficient sustenance and progress.
沿船体的上升的气流和沿航线向前的气流给这种巨翼大鸟以足够的浮力和推力。