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[计] 反向散射
✅ 同义词
🗣️ 情景例句
autograph copies for the guests at the opening?
在展览开幕时为客人在书上亲笔签名呢
It is my pleasure to introduce the keynote speaker for today.
我很荣幸地介绍今天的主讲人。
It's nearly ready.We can have dinner at seven o'clock.
马上就好。7点钟我们可以吃饭。