英语：生词解释

(一）按年月次序排列地（adv.)

(二）日夜不停的，也可以是round the clock

chronologically - according to the order of time
around the clock - all the time, nonstop

1.chronologically

ad. 按年月顺序地,按时间先后
2.around/round the clock
日以继夜地
People with very important jobs sometimes have to work around the clock.
有要职在身的人有时要日以继夜地工作。