在重大活动期间，紧急服务全天候运行。

Emergency services operate ___round ___the ___clock during major events.

许多专业人士为了赶项目截止日期而全天候工作。

Many professionals work ___around ___the ___clock to meet project deadlines.

客服热线全天候有人值守以提供客户协助。

The support hotline is staffed ___around ___the ___clock for customer assistance.