该公司可能无法维持这样的增长速度。

The company may not be able to ___sustain this rate of growth.

他们必须努力工作以达到并维持这个高水平。

They have to work hard to reach and ___sustain this high level.

他无法保持对这个项目的兴趣。

He couldn't ___sustain his interest in the project.