a person who keeps their skills or plans secret until an important moment
一个在重要时刻之前保守技能或计划的人 (yī gè zài zhòng yào shí kè zhī qián bǎo shǒu jì néng huò jì huà de rén)
"Nobody expected her to win; she was a dark horse."
"没有人预料到她会赢；她是一匹黑马。" (méiyǒu rén yù liào dào tā huì yíng; tā shì **yī pǐ hēi mǎ**.)
to prepare energetically to do something
a job with no opportunity for advancement or improvement
to buy something that is defective or worthless
a sudden realization or understanding
to make someone or something more lively or energetic
Keep believing that things will get better.
