effort精力可數嗎

　　This study represents a major expenditure of time and effort.

　　這項研究意味著要耗費大量的時間和精力。

　　The work was done with the minimum amount of effort.

　　做這項工作沒費什么勁。

　　He made a concentrated effort to finish the work on time.

　　他全力以赴以按時完成這項工作。

　　The project has demanded considerable investment of time and effort.

　　該項目已讓我們投入了相當多的時間和精力。

　　We need to make a concerted effort to finish on time.

　　我們需要通力合作才能按時完成。