英语语法分析

The major stumbling block in the talks has been money.

谈判的主要绊脚石一直是钱。

《柯林斯英汉双解大词典》

So what are the stumbling blocks?

那么，障碍是什么呢？

However, there is still a big stumbling block.

然而，仍然有一个很大的障碍。