She tried to keep back her indignation.

　　她試圖抑制住她的憤怒。

　　No one can keep back the wheel of history.

　　沒(méi)人能阻止歷史車(chē)輪的前進(jìn)。

　　But the fire could not keep back the policemen.

　　但火焰不能阻擋警察們的步伐。