Hisam
[计] 分层索引顺序存取法
🗣️ 情景例句
I am hungry.
我真是饿了。
He is a doctor. He has his own practice.
他是个医生，他自己开业。
They had to edge their way along this, sometimes wading across shallow streams, or swimming across deep pools.
他们不得不侧着身子往前走，有时过浅溪，有时游过深潭。