Arsenic hour is the time after parents arrive home from work and before dinner is served; any extremely hectic part of the day, especially when dealing with young children. 

“砒霜时间”指的是父母下班后，晚饭开饭前的这段时间，或者是一天中非常忙碌的时段，特别是带年幼的孩子时。

It's almost dinnertime. Mom or Dad, or both, are trying to get dinner going. They've just arrived home from work or they're reeling from a long day of parenting. They're tired, the kids are wired and everyone is hungry. Among other things. 

快到晚饭时间了，母亲或父亲，或是两个人都在做饭。他们刚下班，或者已经带了一天孩子。他们非常疲惫，但孩子们极其兴奋，每个人都很饿，等等。