dead letter box, dead letter drop
基本释义
密件投递处，秘密信件约定存取点，(机密文件等的)秘密交接地点，“死信箱”
实用场景例句
学术讨论
Their discussion was very fruitful.
他们的讨论非常有成果。
日常对话
Our meeting was quite fruitful.
我们的会议非常有成果。
校园生活
The internship was a fruitful experience for him.
实习对他来说是一次富有成效的经历。
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