We can't take on any more work we're fully stretched (ie working to the utmost of our powers) at the moment.
我们不能再接受更多的工作了--目前已经全力以赴了.
The widowed mother exerted herself to the utmost to send her son to college.
那位守寡的母亲尽全力让儿子念大学。
The meeting was arranged with the utmost secrecy.
会议绝对保密。