But the youthful conviction that the world is there any chance to get together again, for no valid reason a person does not appear in another person's life.

但秋水坚信这世上没有偶然的相逢，一个人不会无端地出现在另一个人的生命里。

youdao

And the reason for that because an argument is valid if and only if there are no possible situation in which all its premises are true and its conclusion false.

原因是因为论点有效，如果且仅如果没有可能情况，所有的前提都为真结论为假。

youdao

If the efficient market hypothesis were valid, there would be an a priori reason for imposing no constraints.

假如有效市场假说有效，放任自流就存在先验理由。

youdao

He said there was no valid reason to possess LSD, 2C-B and mescaline, which are exceptionally strong hallucinogens.

BBC: Drug smuggler jailed for 18 months by Guernsey court

"While nobody suffered any financial loss, Co-op's actions meant that a significant number of people had the resolution of their valid complaints delayed for no good reason, " she added.

BBC: Cash and bank account details