Neurulation
神经胚形成
🗣️ 情景例句
My wife died four years ago.
我妻子四年前去世了。
The black ox has trod on his foot.
祸事临头。
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。