To keep them apart requires great attention.
要分开他们需要巨大的注意力。
The boys are fighting. Please keep them apart.
孩子们在打架，请把他们分开。
The children are fighting. Please keep them apart.
孩子们在打架，请把他们拉开。
The force due to the motion of molecules tends to keep them apart.
分子运动引起的力能使分子分离。
The force due to the motion of molecules tends to keep them apart.
分子运动引起的力能使分子分离。
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