abbr. data reduction 数据缩减量
先理解核心含义，再看它在真实句子里的用法。
abbr. data reduction 数据缩减量
一般现在时
The engine dron softly in the background.
发动机在背景中低声嗡嗡响。
一般过去时
The professor droned on for hours.
教授单调地讲了几个小时。
现在进行时
The bees are droning near the flowers.
蜜蜂在花附近嗡嗡叫。
No learner guide for this sense
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