Sheets of postage stamps are perforated.
一张张的邮票都打过接缝
。
于,在…上打
〔
线〕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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