Once I forget something, it won't come back to me.

一旦我忘记某事，我不会再记起。

youdao

I am happy, because I forget the thing that should forget, since, come in this world, I should leave something, prove at least I had once only been to a world.

我快乐，因为我遗忘该遗忘的事，既然，来到这个世界上，我就应该留下点什么，至少证明我曾经来过只个世界。

youdao

I once heard that, the only thing you can do when you no longer have something is not to forget.

我曾经听人说过，当你不能再拥有的时候，唯一可以做的就是令自己不要忘记。

youdao

"I'll never forget the day I looked down the microscope and saw something funny in the cultures, " Edwards once recalled.

BBC: Test-tube baby pioneer Sir Robert Edwards dies