written guarantee的用法和樣例：
例句
- He was required to give a written undertaking not to disclose the details of their contract.
他被要求出具書(shū)面保證不披露他們的合同的細節。 - However, once a business decides to offer a written warranty on a consumer product, it must comply with the Act.
然而，一旦一個(gè)廠(chǎng)商決定對一個(gè)消費產(chǎn)品提供書(shū)面保證，他就必須遵守這個(gè)法案。
