美 [kiːp bæk]
留下；隐瞒；阻止
keep back //
动词 to refuse to reveal or disclose 拒绝泄露; 拒绝揭露
隐瞒
... ③keep/keep on一般都不能与表示短暂性动作、心理状态或结果的动词连用。 keep back阻止，落在后面 keep…out(of)使…在外，不让…入内 ...
... keep away 使离开 keep back 抑制（感情），忍住 keep busy 让…处于忙碌状态 ...
She was unable to keep back her tears.
她无法忍住泪水。
Barricades were erected to keep back the crowds.
设置了障碍，使人群无法靠近。
Keep back straight and bend knees.
背要直，只弯两膝。
They got back on the train and keep going until they reached the end of the line.
VOA : special.2009.05.31
So let's take our one model that we keep going back to Equation of state, and just see how it works.
我们回到经常使用的理想气体模型,或者说状态方程。
热力学与动力学课程节选 : 麻省理工公开课
STUDENT: PROFESSOR: Yes, thank you. All right, it is constant. You keep sitting back there where I can't get to you. Thank you very much.
学生：【不解中】,教授：是的，是常数，如果，就是常数,你坐在那儿一动不动我没法找到你。
计算机科学及编程导论课程节选 : 麻省理工公开课
Kevin Prochaska says many of his customers keep coming back to his pawn shops.
VOA : special.2011.04.18
"Old anchormen,you see,don't fade away; they just keep coming back for more.
VOA : special.2009.08.16
Those indications that this verdict was based on emotion are contrary to Ms. Moran's efforts to keep back the sympathy that she felt for the Goldman and the Brown family.
Harvey Brown grabs each mesh pot as the winch pulls it out of the water, and methodically packs in more bait, shakes out the crabs into a box on deck, sorts the males from the females, tosses those too small to keep back into the bay and then drops the pot for its journey back to the bottom.
And he'll veto it, send it back, just keep going back and forth like that.