incumber

Further more, the technical efficiency was suppressed by the advantage of resources in this area, strategy of exploring resources incumber the economy in the long run.

分析表明，资源优势妨碍了技术效率提高，资源开发战略不利于经济增。

However, NC devices have high prices and there’re some volatile factors when NC system is under the practical operation, which incumber the testing and operation process.

但数控设备成本较高，同数控系统实际运转过程中存不稳定因素，给运行调试工作带来不便。