Backscatter
[计] 反向散射
✅ 同义词
🗣️ 情景例句
Western countries have evry strict visa requirements.
在西方国家有严格的签证要求。
Suit the action to the word.
怎么说就怎么做。
When I asked him what he was doing, he smiled guiltily and then put the parcel on the desk.
当我问他正干什么时，他内疚地笑了，然后把那个大包拿到了桌上。