精品学习网考试频道小编应广大考生的需要，特为参加考试的考生策划了“PETS4写作精选短语：Ace in the hole”专题等有关资料，供考生参考!
Ace in the hole
a hidden advantage kept for later use that will help a person win (ace is a valuable playing card); alternatively, “an ace up your sleeve”
EXAMPLE:
“When he tried to get a job at the XYZ Corporation, John did quite well in the rigorous interview process, but he knew that his ace in the hole was the fact that his wife had a relative on the board of directors.