Ooh, speaking of keeping busy-I have an early start tomorrow,and the baby-sitter has to get home.
哦, 说到忙于工作,我明天还得早起,而且临时保姆也该回家了。
but that was precisely the idea adopted in some of the early instruments (seismometers) for recording earthquake waves.
但是早期记录地震波的仪器(测震仪)正是采用了这种思路。