The useless must be mingled with happiness.

幸福需要一些无用的东西。

youdao

Let the winds and waters be mingled with our melo - dy.

让风和水与我们的快乐混合在一起。

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The girl's whispered words mingled with the shades, and, to Tess's drowsy mind, they seemed to be generated by the darkness in which they floated.

女孩子的喃喃细语混合着沉沉的夜色，在半睡半醒的苔丝听来，它们似乎是从黑暗中产生的，而且漂游在黑暗里。

youdao

Australians mingled with the home crowd in front of the big screen, awaiting what most anticipated would be a routine win for the top seed.

BBC: Aussies discover losing habit

But the minister's admiration for British ingenuity is mingled with a barely-concealed dread: that the most promising offerings from the labs might not be turned into commercial products by British companies.

BBC: Can UK science navigate around the Valley of Death?