In the nature of things: used for saying that sth that happens is normal in a particular situation and not at all surprising 理所當(dāng)然,自然,絲毫不令人奇怪

Don't worry about it. It's in the nature of things for children to argue with their parents when they are teenagers.
青少年常常會(huì)和他們的父母爭(zhēng)辯,這不足為奇.
In the nature of things, people who have power don't like losing it.
有權(quán)利的人不想失去他們的權(quán)利,這很自然.

let nature take its course:to allow events to happen without doing anything to change the results任其發(fā)展;聽其自然

With minor ailments the best thing is often to let nature take its course.
對(duì)于小病,往往最好是聽其自然.