be at it

基本解釋

A remarkably high proportion of officials now seem to be at it.
現(xiàn)在看來涉嫌於此的官員比例巨大。
The more you achieve small goals, the better you'll be at it, and the better you'll feel.
你完成的小目標越多，你在這方麪就越強，你的感覺也會越好。
blog.sina.com.cn
After a month or two, people will be at it again.
而後一兩個月，人們又會入市。
blog.sina.com.cn

It wants to look at what it means to be Chinese-American today and what it will mean looking forward.
How do we have a conversation about what does it mean to be a well-rounded student at an American university today?
我們?nèi)绾谓⑦@樣一個對話,就是在儅今的美國大學(xué)中,如何才能成爲一個全方位發(fā)展的學(xué)生？
普林斯頓公開課 - 人性課程節(jié)選
so it really makes it seem a lot more attainable to, to be at that level in academia,
你會覺得在學(xué)術(shù)上達到那種水平是可以實現(xiàn)的，
我喜歡的教授 - SpeakingMax英語口語達人

When Reddit redesigns -- and they will -- you can bet that throngs of angry, old 20-somethings will be at it again.
ENGADGET: This is the Modem World: We're all a bunch of cranky old men