一只脚门里一只脚门外

　　door salesman will tell you that he must really and truly have a foot in the door (ie. be invited into a home) before he can sell someone his products.

　　However, as an idiom, to have a foot in the door means to be allowed to join a company, a group, a club, an activity, etc, as one's first step toward success.

　　"I'm not a star yet, but I think I have a foot in the door because I've already appeared in two films this year," Jimmy smiled.

　　踏上成功第一步

　　一名成功的入户拜访推销员在把他的产品推销出去前，他总会告诉你他的一只脚已经伸进门里边了(也就是说他已经被邀请入屋)。

　　但是，作为一个俚语，to have a foot in the door 意思是说被允许加入某个公司，某个组织，某个俱乐部或者某项活动等等，这只是某人踏上成功的第一步。

　　吉米笑着说：“我现在还不是一名明星，但我想我已经踏上了成功的第一步，因为今年我已经出演了两部电影。”