stumbling block

 Longman Dictionary of Contemporary English 5++朗文当代英语 5++LDOCE 5++朗文 5++ˈstumbling ˌblock noun [countable]  a problem or difficulty that stops you from achieving something 障碍物，绊脚石stumbling block to The main stumbling block to starting new research is that we lack qualified people. 开始新研究的主要障碍是我们缺少合格的人员。

Examples from the Corpus

stumbling block• It is still foolishness and a stumbling block.• They needed the scrupulous professional integrity which nearly proved such a stumbling block to them in this case.• Only rarely is the lack of sufficient minimum capability a real stumbling block to change.• In the autumn of 1987, Conran ran into a potentially more serious stumbling block to his plans.• The stumbling block is a case challenging the constitutionality of the new law.

ˈstumbling ˌblock nounChineseSyllable  

Corpus you stops or a problem difficulty that

stumbling block
ˈstumbling ˌblock noun [countable]
a problem or difficulty that stops you from achieving something
    stumbling block to
    The main stumbling block to starting new research is that we lack qualified people.

stumbling blockBrE /ˈstʌmblɪŋ blɒk/ 🔊NAmE /ˈstʌmblɪŋ blɑːk/ 🔊 noun~ (to sth) | ~ (to doing sth) something that causes problems and prevents you from achieving your aim 障碍物；绊脚石 SYN obstacle