“如果无能为力。那就顺其自然”翻译成英语怎么说？

If you can't do anything,just let nature take its course.
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If there is nothing you can do then it's just better to let things run their own term_
纹身的竟要精简一些了:

Let things be if you can't help it!

If there's nothing you can do about it, just let it be.