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 gradually move up to higher positions in an organization
something that will never happen
To support or stand by someone in times of need
to tremble with fear or nervousness
a clever or innovative idea
to try any method to succeed, even if unlikely
