Peristroma
护膜, 管状波膜
🗣️ 情景例句
Are you ready to order now, sir?
先生，你准备点菜吗？
What were you doing when I called?
我打电话给你时你在干吗？
We may have to back order three items on this order.
这次订的货有三个项目必须要晚点才能交货。