Blue stands for love, which is why a bride carries or wears something blue on her wedding day.

蓝色代表爱情，这就是为什么新娘在婚礼当天总是佩戴一件蓝色的东西。

youdao

Say someone is blue, because of true love? We step in, or his or her caregiver does: blue no more.

再比如说，如果有人因为真正的爱情而忧郁了，我们——或者他或她的监护人——就可以出手，然后他就再不会有什么忧郁了。

youdao

I love how the day slowly gets brighter, when the midnight blue turns to lighter blue, when the brilliant colors start to seep into the sky, when nature is painted in incredible colors.

我喜欢看那天空渐渐亮起来，从深蓝变成浅蓝，光辉从天际渗出，大自然被涂上了绚丽的色彩。

youdao

For many years the weather forecast at the end of Soviet TV's nightly news broadcast was accompanied by an instrumental version of a 1967 Eurovision hit - "Love is Blue".

BBC: Five minutes of Eurovision fame