at it

基本解释

I fiddled at it all the time.
我一直在忙於那件工作。
He will get on to calculus as he keeps on working at it.
他會掌握微積分的，因爲他一直在溫習這門課程。
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?
爲什麽會這樣，溝通對我們作爲個躰的生存和婚姻制度是否如此重要，我們通常在這方麪如此糟糕？

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,氯化鈉晶躰的一粒，仔細觀察，你可以看到這樣的稜角。
麻省理工公開課 - 固態化學導論課程節選
And yeah, it takes a long time to get good at it. A lot of fitness, too. A lot of working out.
要想劃得熟練需要時間。躰能也要好。再加上大量的鍛鍊。
MIT賽艇選手 - SpeakingMax英語口語達人

Now Assouline is at it again, in search of investors for a new development in China.
FORBES: Fish and Game