good as gold

phr

• ① (尤指小孩)行为良善的;非常亲切的
  • The children were as good as gold while their mother was out.母亲出去时,孩子们都循规蹈矩。

• ② 一诺千金的
  • Mary's promise is as good as gold.玛丽答应的话是一诺千金。