Backgear
[机] 后列齿轮
🗣️ 情景例句
Can I help with anything?
我能帮什么忙吗
Dad is building another room onto the back the house.
爸爸另外在屋子的后面盖一个房间。
This immense chasm has been formed by an underground stream which has tunneled a course through a flaw in the rocks.
这个深邃的洞穴是由一条地下暗泉冲刷岩石中的缝隙并使之慢慢变大而形成的。