to back and fill

出尔反尔/朝三暮四



例如：You shouldn't back and fill.It's time to make your choice.

别犹犹豫豫了。是该你作出选择的时候了。



Those who back and fill at the problem should be got rid of.

那些在这个问题上出尔反尔的人应该被赶出去。


关键字:英语词汇
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