1. I knew that I am a genuine double-dealer. 我知道,我才是一个真正的两面派。
2. I knew that I am a genuine double-dealer. 我明白,我才是一个真正的两面派。
3. The art dealer agreed to sell me the painting, but then double-crossed me when somebody else offered to pay more for it. 这个艺术品商人同意把那幅画卖给我,但有人愿出更高价时,他便欺骗了我。