财务限制常常是创新的主要障碍。

Financial constraints often serve as a major ___block to innovation.

对许多学习者来说，主要的障碍是准备不足。

For many learners, the primary ___block is insufficient preparation.

官僚主义的繁文缛节是完成文书工作的持续障碍。

The bureaucratic red tape is a constant ___block in completing the paperwork.