If it was natural causes, it's plausible that there was something missed in the postmortem.

如果是自然原因，可能有什么东西在验尸中漏掉了。

youdao

'we've been investigating what causes people to be late sleepers and one of the most plausible explanations we're perusing is that their body clocks run longer than 24 hours.

我们已经调查研究了什么原因导致总有晚睡的人，其中一个貌似合理的解释就是他们的生物钟长于24小时。

youdao

If we are looking for plausible causes of combat between China and America, they are not to be found in future Pearl Harbors that is, in head on collisions of national interest.

FORBES: Is China the Enemy?