have a lot on one's mind 有事在心上，有很多烦心事

　　You look like you have a lot on your mind.

　　你看起来有很多心事啊。

　　I know you have a lot on your mind, but we still have work to do.

　　我知道你有很多烦心事，但我们还有许多工作要做。

　　疯狂练习吧！