effort：
n.氣力;努力;費力的事;艱難的嘗試;試圖;盡力;有組織的活動；
復數： efforts
例句：
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。
The local clubs are making every effort to interest more young people.
地方俱樂部正在盡一切努力來吸引更多的年輕人。