单词：cardiac operation under direct vision
cardiac operation under direct vision的用法和样例：
例句
- In cardiac operation,it is used for attracting the blood in left atrium through atrial septal or upper lung vein,inserting in left atrium.在心脏直视手术中，经房间隔或左上肺静脉，插入左房，吸引左房内的血液。
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