短语词组短语lower extremtity venous ulcer 下肢静脉性溃疡chronic venous ulcer 静脉性溃疡lower extremity venous ulcer 下肢静脉性溃疡venous ulcer of lower extremities 下肢静脉性溃疡venous ulcer of lower extremity 下肢静脉性溃疡 返回 venous ulcer