The second stumbling block has been bad luck.

第二个障碍物可归结为接踵而来的霉运。

One stumbling block, though, in this growing relationship has been Iran.

但这一不断发展的关系面临一个障碍，那就是伊朗。

The culture conflict, however, poses a serious problem, which becomes a stumbling block in the way.

尽管十分严重的文化冲突成为了跨国婚姻的一个绊脚石。

Another stumbling block in 2020, the COVID-19 pandemic, forced the school to close the boarding section.

2020年的另一个绊脚石-新冠肺炎，迫使学校关闭了寄宿部。

Things that Republicans know can't get democratic votes and that's our stumbling block right now.

共和党人知道这些要求不能得到民主党的投票，这是我们现在的绊脚石。

Conflicts between Israelis and Palestinians had been called " a major stumbling block" to Middle East Peace.

以色列和巴勒斯坦之间的冲突被称为中东和平的“绊脚石”。

Conflicts between the Israelis and Palestinians have been called a major stumbling block to Middle East peace.

以色列和巴勒斯坦之间的冲突被认为是中东和平的主要绊脚石。

One common stumbling block is the difference between relative risks like these and what are called absolute risks.

使人摸不着头脑的是相对风险与绝对风险之间的区别。

But for people in full-time employment, getting the balancing act between work and studying can prove a stumbling block.

但对于全职工作的人来说，在工作和学习之间取得平衡可能是一个绊脚石。

Faced with such a serious stumbling block, most students would probably look for another project, if not another research advisor.

面对如此严重的绊脚石，大多数学生如果没找另一个研究顾问，也可能会寻找另一个项目。