We've only sold our product at trade fairs, not in an on-going sales campaign.
我们的产品只在商展时展售,而没有办促销活动。
I'm afraid I can't agree with you. That's a good way of giving information, but it's not a good way of persuading people. For one thing, it's boring, and people aren't going to read an ad that looks boring. For another thing, one computer looks very like