They will stick together through thick and thin.

不管有什么艰难险阻他们都会团结在一起。

I'll stick with you through thick and thin.

我将与你风雨同舟。

Hope it helps you all through thick and thin!

希望能帮到你们这些同甘共苦的朋友。

You can say, " We have been through thick and thin together."

你可以说，“我们同甘共苦。”

Another way to say this is to see them through thick and thin or be with them through thick and thin.

这个换个说法就是“见证他们起起伏伏”或者“同甘共苦（be with them through thick and thin）”。

Here are two examples: John and Lisa have been friends through thick and thin.

约翰和丽莎是同甘共苦的好朋友。

They are usually there for their children through good and bad times, or through thick and thin.

他们通常会陪伴孩子度过好时光和坏时光，或同甘共苦。

Through thick and thin, Queen Elizabeth II provided us with the stability and the strength that we needed.

伊丽莎白女王二世为我们提供了我们所需要的稳定和力量。

A good friend will see you through thick and thin, meaning both the good times and the bad.

一个好朋友，会陪你经历thick and thin（任何事情），意思就是美好的时光和困难的时光。

But we also say through thick and thin and it means in spite of any difficulties or problems.

但是我们也说同甘共苦，意思是不管有任何困难或问题。

We held together through thick and thin.

我们在成功和失败中同甘共苦。

You two have stood together through thick and thin, right?

你们两个人一起同甘共苦?

Jean has stuck by her husband through thick and thin.

【stick】琼对丈夫患难不弃，艰苦与共。

Through thick and thin Washington's commitment to his men earned their fierce loyalty.

华盛顿对他的部下的承诺赢得了他们的强烈忠诚。

Finally a thermonuclear power forced them to get out therefrom through thick and thin.

但最终是热核的能量迫使他们不顾艰难险阻地从那里跑出来。

These people have been through thick and thin with us, and they know us intimately.

這些人與我們一起經歷過風雨, 他們非常了解我們。

And quite rightly so, because they've been with me through thick and thin throughout the years.

这是非常正确的，因为多年来他们一直陪伴着我。

They have been through thick and thin together and have a level of comfort and trust with one another.

他们一起经历了风风雨雨, 彼此之间有一定程度的舒适和信任。

So, mom, I wanna say thank you for everything that you've done. I love you very much. You've been there through thick and thin.

所以，妈，我想要说谢谢你所做的一切。我非常爱你。在任何情况下你一直都在那儿。

The idiom " through thick and thin" is used to define a friend who is loyal and supportive during bad times as well as good times.

成语" 同甘共苦" 用来描述一个在你顺境或者逆境都很支持你的忠实朋友。