Person's life only once, can not change, copy, in today's world of law also does not allow cloning.

人的生命只有一次，不能改变，不能复制，当今世界的法律还不允许克隆。

youdao

Youth, give you, my life only once, prime not heavy, once a day morning, when encouraged in time, time and tide wait for no man.

青春，只赋予你、我一生一次，盛年不重来，一日难再晨，及时当勉励，岁月不待人。

youdao

We each person's life only once, so we all want to cherish life, can't make fun of life, be sure to anywhere to safety awareness.

我们每个人的生命只有一次，所以都要珍惜生命，不能拿生命开玩笑，一定要随时随地都要安全意识。

youdao

He says he faces life with less fear than he did before, knowing that life only comes around once and somehow things will work out.

CNN: Tuesdays with Morrie

On the other hand, Perry could require you to make the choice only once in your life.

FORBES: Perry's Optional Tax Scheme Would Be A Certain Mess

Prof Sheila MacNeil, from Sheffield University, said the technology was based on two clever concepts - that it only reacts in the presence of life-threatening bacteria and that the florescent dye only shows up once the nanocapsules have burst.

BBC: Burn dressing 'lights up' to signal an infection