担保
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I vouch for the accuracy of my information.
I can answer for her honesty.
I'd stake my life on it. / I bet my life on it.
give one's word of honour; pledge/pawn one's honour
vouch for him
give security for repayment
She gave him her title deed for the house in surety of the loan.
lifetime guarantee
material security
double securities
personal security
necessary security
furnish/offer security
decline security
accept security
obtain security