求翻译：忘记那些不开心的人与事，既然没有时光机可以改变和补救，那就选择忽略，要知道，人的精力是有限的，与其苦苦与过去纠缠，不如将精力用在现在，以保证能获得将来的幸福。是什么意思？

Forget those unhappy people and things, as there is no time machine can change and remedy, then choose to ignore, you know, the people's energy is limited, and its entanglement with the past, rather than using the energy in now, to guarantee access to future happiness.