at it

基本解释

I fiddled at it all the time.
我一直在忙于那件工作。
He will get on to calculus as he keeps on working at it.
他会掌握微积分的，因为他一直在温习这门课程。
http://dict.hjenglish.com
Why then, if communication is vital to our survival as individuals and to the institution of marriage, are we often so bad at it?
为什么会这样，沟通对我们作为个体的生存和婚姻制度是否如此重要，我们通常在这方面如此糟糕？

You really have to work at it." Junior Achievement says three hundred eighty-five thousand volunteers support its programs around the world.
If you take one of those individual grains of sodium chloride, look at it carefully, you will see the edges look like this.
如果你拿起,氯化钠晶体的一粒，仔细观察，你可以看到这样的棱角。
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And yeah, it takes a long time to get good at it. A lot of fitness, too. A lot of working out.
要想划得熟练需要时间。体能也要好。再加上大量的锻炼。
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Now Assouline is at it again, in search of investors for a new development in China.
FORBES: Fish and Game