Much of the grieving parents do is over the non-occurrence of the expected relationship with an expected normal child.
父母们悲伤的是,他们和一个正常的孩子建立一个正常的亲子关系的期望落空了。
2
There is such a kind of uncertain phenomenon in the realistic world, that is, the occur-rence or non-occurrence is determinate, but the event itself is unclear.
在现实世界中,有这样一类不确定的现象,即事件发生与否是确定的,但其本身是不分明的。
3
The occurrence of any of these complications may require additional surgical or non-surgical treatment.