to make a very serious promise that something is true
做出一个非常严肃的承诺，证明某事是真实的 (zuòchū yīgè fēicháng yánsù de chéngnuò, zhèngmíng mǒu shì shì zhēnshí de)
"I swear on my life, I didn’t do it!"
"我发誓以我的生命，我没有做！" (Wǒ **fāshì yǐ wǒ de shēngmìng**, wǒ méiyǒu zuò!)
As I understand; based on what I know
to share personal thoughts or feelings
to escape punishment or consequences without facing any pena...
to have a small opportunity to start working in a company or...
to reach maturity; to become fully developed
an unidentified but informed source
