I don't know your sad song.

我不知道你的难过时的歌。

youdao

"The better solution is to make your sad friends happy," said Rand.

“更好的办法是让你的朋友变得开心”Rand补充道。

youdao

I was very sad indeed to hear of your father's death.

听到令尊大人去世，我感到非常难过。

《牛津词典》

One music expert said: "Your Cheatin' Heart" is so sad, it sounds like a judge sentencing somebody to a punishment worse than death itself."

VOA: special.2009.11.22

Bitter constraint, and sad occasion dear, Compels me to disturb your season due: For Lycidas is dead, dead ere his prime... Milton is lamenting, once again, that Milton has been compelled to begin writing.

因为亲友的惨遇，痛苦的重压，迫使我前来扰乱你正茂的年华：,利西达斯死了，死于峥嵘岁月。,弥尔顿再一次哀叹道，他是不得以写这首诗的。

耶鲁公开课 - 弥尔顿课程节选

One of the most famous of these sad songs is "Your Cheatin' Heart."

VOA: special.2009.11.22

Your sad end to life is like an unpublished script.

BBC: China editor's suicide sparks web debate

You have to let yourself feel unhappy for a bit, and if you recognize your feeling and acknowledge it, you can have your sad moment and then move on.

FORBES: Do One Thing at a Time

Those head doctors, they have a term for the effect a lack of sunshine has on your physiology: SAD, or seasonal affective disorder.

ENGADGET: Nothing quite as SAD as a phone without LEDs Mobile