The cause of his health complications are still unknown.

他的病因尚不清楚。

She developed complications after the surgery.

她手术后出现了并发症。

Normally there are no complications with the medicine.

服用这种药按理不会产生并发症。

There are too many complications to explain now.

现在有太多使情况复杂化的因素要解释。

I mention this because such complications should alert the careful reader. Right?

我提到这个是因为这样的复杂度应该引起细心的读者的注意。对吗？

Miss Rottenmeier was very much excited about Heidi's coming and all the complications that arose therefrom.

罗特麦耶小姐对海蒂的到来以及随之而来的各种复杂情况非常激动。