1.开业大吉
Congratulations on your new business!
2.卖点
俗一点就说selling point,书面语一点就说competitive advantage,即竞争优势.
比如说：The selling point/competitive advantage of this dress is its unique cutting这件衣服的卖点在于它独特的剪裁.
3.主打
specialty
例句：The song "Complicated" is the specialty of Avril's first album.《超复杂》是艾薇儿第一张专辑的主打歌.
4.理亏
其实“理亏”就是说“不正确,犯错”.如果说：“我理亏”,就是I am in the wrong.
5."你忙你的"
这个可以用意译法.Please go on with your business.这里的business泛指“手头上的事”
6.赛马节
Horse Racing Festival