U-6：up to the hilt 彻底

A:I'd back him up to the hilt any day.

A:我会一直支持他的。

B:Why are so kind to him?

B：为什么你对他那么好?

A:He's my brother.

A:他是我哥哥。

B:So that's how it is! Now he is in trouble, but I believe he will rise to his own feet again.

B：原来如此。他现在是有点麻烦，但我相信他一定会重新站起来的。

A:Thanks for your belief.

A:谢谢你的信任。