belong to: 属于
Most belong to the sunni branch of islam.
大多数人属于伊斯兰教的一支逊尼派教徒。
It doesn't belong to any of those 16 countries.
他并不属于这16个国家中的任何一个。

stand on: 坚持
Let it go. The kids walked for three miles to get here. We don't have a leg to stand on.
过去就算了吧，孩子们走了3英里路跑到这里。我们腿都快受不了了。