lone hand

1. This is a country that played a lone hand in the trade negotiations.
   这是个在贸易谈判中采取单独行动的国家。
2. I want to impress Waggett with the fact that I am not playing a lone hand in this matter.
   我要瓦格特明白我并不是单枪匹马一个人在干这事。
3. "When investing in a business, he always likes to play a lone hand"
   在投资时，他总喜欢单枪匹马地去干

noun

1. a person who avoids the company or assistance of others

   Synonym:    lonerlone wolf