N-COUNT A permanent wave is the same as a . 同 perm [老式]
Do you want a permanent wave or a cold wave?
要我帮你烫一烫裤子吗?。
For several years after that he kept getting the permanent wave.
此后数年他一直保持烫发的发型。
A permanent magnetic (PM) linear wave power generator was developed to generate electricity directly from wave power.
为了直接把海洋的波浪能转换为电能,提出了一种永磁直线波力发电机。
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