If you are "true blue," you are loyal and faithful.

如果你是“真正蓝色(true blue)”，说明你忠诚，守信。

youdao

Ed was true blue when our company met rough times and other workers were deserting us.

当我们的公司遭遇困难，别的员工都纷纷离去的时候，艾德却对我们忠心耿耿。

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In fact, when my old, true blue Samsung model dies, I'll probably upgrade to something a little more advanced.

实际上，当我的老旧纯蓝色三星手机不好用时，我可能购买更先进的机型。

youdao

Founded pachinko and slots company Aruze, which recently acquired U.S. gaming-machine content supplier, True Blue Gaming.

FORBES: Magazine Article

All my Evertonian friends have been saying she is a true blue because she made me miss the game!

BBC: SPORT | Football | Kevin Nolan column

In the jungle of the financial world, there are few true blue gentlemen of ideal temperament and standards, whose word you can trust.

FORBES: True Blue Gents Of Finance