She was unable to keep back her tears, and wept freely.她抑制不住泪水, 痛痛快快地哭了起来.A slow learner can keep back the whole class.反应迟钝的学生会影响全班的进步.I asked the spectators to keep back from the sideline.我要求观众们不要走近边线....

keep back的音标：keep back的英式发音音标为：[ki:p bæk]keep back的美式发音音标为：[kip bæk]...

扣留，隐瞒，阻止…前进，留在后面...