Polyliner
多孔衬套
🗣️ 情景例句
We are prepared for the worst.
我们已有最坏的打算。
Can I fix an overseas call to London by person-to-person call?
我要打到伦敦的叫人电话好吗？
The first records the arrival of longitudinal vibrations.
首先记录下的是纵向波的到达；