Bivallate
a. 围有两层防护土墙的
🗣️ 情景例句
Five five five...one seven two oh. Hello? 555-1720
喂 喂?
I will be very glad when I receive the letter.
如能接到你的来信，我将会非常高兴。
This modern faith in medicines is proved by the fact
这个事实证实了现代人对药物的信赖。