Sheets of postage stamps are perforated.
一张张的邮票都打过接缝。
Sheets of postage stamps are perforated.
一张张的邮票都打过接缝。
The insufficiency of perforating veins is the main cause resulting in the recurrence of varicose veins after varicotomy in lower extremities.
交通功能不全是导致下曲张术后复发的主要原因。
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