(2)表示较多数量的:ashes, outskirts, wages, dregs
9)部分学科名词,虽以-s结尾,但用作单数。常见的有:
Acoustics, economies, electronics, ethics, mathematics, physics, politics, statistics, mechanics
10)有些名词在习惯用语中常以复数形式出现。例如:
Jim is friends with Tom. 吉姆与汤姆友好。
Do you want to change places with me? 你要和我调位置
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