If someone is pitching a deal/opportunity which isn't what you are looking for, let him/her know straight-out that it doesn't meet your needs. Otherwise, the discussion can drag on longer than it should. It helps as the person know it's nothing wrong about what he/she is offering, but that you are looking for something else. At the same time, by saying you'll keep him/her in mind, it signals you are open to future opportunities.
如果有人向你提出一项交易或是一次机遇，而它并不是你所想要的，那么就坦白地告诉他/她这不合你的需求，否则这次的谈话将被拖延下去。这句话能让对方知道他/她提出的事情并没有问题，只是不是你所需要的。同时告诉对方你会记住此事，那就表明如果以后有合适的机会你还愿意接受。