见 all
engaged in some activity, typically a reprehensible one
在从事（应受指责的）活动
the guy who faked the Hitler diaries is at it again.
那个伪造希特勒日记的家伙又在胡编乱写。
the guy who faked the Hitler diaries is at it again.
那个伪造希特勒日记的家伙又在胡编乱写。
the guy who faked the Hitler diaries is at it again.
那个伪造希特勒日记的家伙又在胡编乱写。
the guy who faked the Hitler diaries is at it again.
那个伪造希特勒日记的家伙又在胡编乱写。
the guy who faked the Hitler diaries is at it again.
那个伪造希特勒日记的家伙又在胡编乱写。
in addition; furthermore
而且；此外
it was not fog but smoke, and very thick at that.
那不是雾而是烟，而且很浓。
(informal)the fashionable place, possession, or activity
(非正式)时髦的地方（或物品、活动）
New York is where it's at， stylewise.
纽约是时尚方面的好去处。
Engaged in verbal or physical conflict; arguing or fighting
争论，冲突：口头或身体上的冲突；争论或冲突
The neighbors are at it again.
邻居们又吵起来了