Overcrowding remains a large obstacle to improving conditions.

过度拥挤仍然是改善条件的一大障碍。

A lack of qualifications can be a major obstacle to finding a job.

学历不足可能成为谋职的主要障碍。

The agreement removes the last serious obstacle to the signing of the arms treaty.

该协议为武器条约的签署去除了最后一个重大障碍。

But school often ACTS as an obstacle to success.

但学校常常成为一种阻碍。

This is the biggest obstacle to Brazil's ambitions.

这是巴西实现其野心的最大障碍。