She had asked him to come and see them, asd now they were gone.

列宁娜请他来看他们，可他们却走掉了。

Small ASDs do not cause any symptoms and may not require treatment.

很小的房间隔缺损不会引起任何症状，不需要治疗。

In ASD patients, this septum is defective allowing blood flow between the two chambers.

ASD患者的房间隔是有缺损的，血液可以在两个心房内流动。