2--Let's listen to my friends talking, and using this American idiom:
 
1--At first, the insurance company didn't believe me，when I said the driver ran the red light before hitting my car.
 
2--But, there's a video that clearly showed his car going through the red light.
 
1--Oh, in that case, he doesn't have a leg to stand on!
 
2--He's going to have to pay to fix your car.
 
1--Not having a leg to stand on means a person does not have any evidence to support his or her argument.
 
2--Without evidence, your argument does not stand up under questioning because, if you think about it, not having a leg would make it difficult to stand.
 
===================================
注解：
 
1.arguments参数
2.insurance保险
3.evidence证据

===================================
译文：
 
1--今天栏目的内容是一个与论点和腿有关的习语。站不住脚
2--大家一起听听我的朋友们是如何谈论和使用这个美国习语的。
1--起初，保险公司并不相信我，当我说司机闯了红灯才撞到我的车时。
2--但是，当时的监控视频清楚地显示，他的车闯了红灯。
1--哦，在那种情况下，司机说的话就站不住脚了。
2--他将不得不支付你修车的钱。
1--站不住脚的意思是，一个人没有任何证据来支撑他自己的论点。
2--没有了证据，你的论点就不会站得住脚，在受到质疑的情况下，这是因为，请你想想，没有一条腿是很难站立的。