Bka
abbr. 膝下截肢（below the knee amputation）
🗣️ 情景例句
He's still not used to life in the city.
他仍然没有适应城市生活。
I've got a pain in my neck.
我的脖子痛。
Precautions of this sort are necessary, for it is impossible to foretell the exact nature of the difficulties which will confront the pot-holer.
作出这样的准备是必要的，因为无法预见到洞穴探险者究竟会遇到什么性质的困难。