keep sb. from doing sth. 的意思是“阻止/防止某人做某事”（这其中的from是不可省略的）
keep sb. doing sth. 的意思是“使得某人保持做某事”,意思就和有from的不同了
例句：
We should keep them from killing the wild animals.
我们应该阻止他们滥杀野生动物.
We kept them waiting for us for a long time.
我们使他们一直等我们很长时间.
keep的短语keep sb from doing
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