裂;Sheets of postage stamps are perforated.
一张张的邮票都
过接缝孔。
)齿孔〔孔线〕Sheets of postage stamps are perforated.
一张张的邮票都过接缝孔。
The insufficiency of perforating veins is the main cause resulting in the recurrence of varicose veins after varicotomy in lower extremities.
交通静脉功能不全是导致下肢静脉曲张术后复发的
因。
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