... a horse of another color那完全是另一回事 black dog 沮丧 yellow dog 卑鄙的人 ...
2
?风马牛不相及
...e(吹牛)、as strong as a horse(体壮如牛)、work like a horse(像 牛一样地辛苦干活)、a horse of another color (风马牛不相及),等等。 比喻“胆小”，我们会立刻想到中文的“胆小如鼠”，中国人常用鼠来形容胆子小。
双语例句
1
It is ahorseofanothercolor. We cannot mention them in the same breath.
这是风马牛不相及的事，我们不能把它们相提并论。
2
And a rider whose horse failed to win of course lost to ahorseofanothercolor.
如果骑士的马未能获胜，骑士当然就输给了另一种颜色的马。
3
Today, when you say, "That's ahorseofanothercolor, " you mean that an entirely new situation has arisen and you must consider the change before making a decision.