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Residue
01
残留物, 剩余物
a small remaining amount or part of a thing after it has been taken, used, etc.
Example
The chemist found a residue of chemicals left in the test tube after the experiment was completed.
After cleaning the windows, there was a stubborn residue of soap scum that required additional scrubbing.
Despite thorough washing, a residue of coffee stains remained on the bottom of the mug.
02
残余, 残留物
something left after other parts have been taken away
