Bivallate
a. 围有两层防护土墙的
🗣️ 情景例句
She's looking for a part time job.
她在寻找兼职工作。
Don't forget to put stamps on the letter.
不要忘记在信封上贴邮票。
The ground supported fewer plants, and the insects which lived on these plants died out.
地上长的植物少了，生活在这些植物上的昆虫就消亡了。