他是一匹黑马，没人预料到他会赢。
tāshì yīpǐ hēimǎ ， méi rén yùliàodào tā huìyíng 。
He is a dark horse; nobody expected that he would win.
在这次比赛中，那个选手成为了黑马。
zài zhècì bǐsài zhōng ， nàgè xuǎnshǒu chéngwéi le hēimǎ 。
In this competition, that athlete became the dark horse.
许多人认为他是个黑马，尽管他没有太多人关注。
xǔduō rén rènwéi tāshì gè hēimǎ ， jǐnguǎn tā méiyǒu tàiduō rén guānzhù 。
Many people think he is a dark horse, even though he doesn't have much attention.