press for1.迫切要求；紧逼,催促：
The members of the committee agreed to press for the conference to deal with the problem.
委会们同意敦促大会处理这个问题.
2.[口语]缺少(钱、时间等)：
I am pressed for time as I have a lot of work to do.
我时间很紧,因为我有许多事要做.
press on (或 upon)1.抓紧；决心继续；向前推进：
We must press on with the work if we are to finish it in time.
如果我们打算按时完成这一工作,我们必须继续努力.
2.压,按：
You have to press on the handle to turn it,it's very stiff.
你必须用力压这个把手,再转动它,它不太灵活了.
3.使…担忧：
The realities of the present pressed on them.
目前的现实令他们担忧.
4.迫使…接受：
His grandmother was pressing on him cups of tea and chocolate cookies.
他奶奶竭力劝他多喝茶,多吃巧克力饼干.
5.向(某人)强调…重要：
I need not press the urgency of the matter on you,as I konw you are fully aware of it yourselves.
我无需向你们强调此事的急迫性,因为我知道,你们自己对此完全了解.