due diligence
noun [ U ] uk/ˌdjuː ˈdɪl.ɪ.dʒəns/ us/ˌduː ˈdɪl.ə.dʒəns/
（为保证自身、他人或财产安全而采取的）审慎行为
action that is considered reasonable for people to be expected to take in order to keep themselves or others and their property safe
People have to exercise due diligence and watch what's being bought on their credit cards. 人们应该行为审慎，关注自己信用卡的使用情况。
business, finance & economics specialized（与某公司有业务往来之前对其本身以及其财务状况进行的）必要核计，必要了解
the detailed examination of a company and its financial records, done before becoming involved in a business arrangement with it