[, ]something that is done in advance in order to prevent problems or to avoid danger 预防措施；预防；防备◆safety precautions 安全防范措施◆E-commerce companies have to take precautions against computer fraud. 电子商务公司不得不采取预防措施，防止计算机欺诈。◆Run a virus check on a file before opening it as a precaution. 在打开文件之前，运行杀毒软件查杀病毒，以防万一。▸precautionary /prɪˈkɔːʃənri; NAmE-neri/
adjective
◆The bank has suspended its online banking service as a precautionary measure. 为谨慎起见，这家银行已暂停其网上银行服务。