The beaches were closed as a precautionary measure.作为预防措施，海滩被关闭了。The local administration says the curfew is a precautionary measure.地方当局说宵禁是一种预防措施。He was kept in hospital overnight as a precautionary measure.他在医院住了一晚以防万一。As a precautionary measure repeat the medication.为了预防起见，要接着服药。