说明
on (the) top of/at the top of
核心问题
（1）He lands on top of each house and climbs down the chimney into the fireplace.
(2) Strong winds can also blow away the valuable soil that lies on the top of the fields.
句(1)中 on top of 与句(2)中的 on the top of 有无区别？又，它们与 at the top of 是否同义？
词典解答
on the top of 亦可写作 on top of, 在语义上并无什么区别。当把处所看作一个面(或者较大的面积)并且表示一物在另一物的上面时, 使用 on (the) top of。当表示某物本身的上部时, 使用 at the top of (the 不可省略):
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On the top of the mountain stands a very old tower. 一座很古老的塔屹立在山顶上。
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She's taken the bag that usually sits on top of the cupboard. 她把经常放在衣橱顶上的手提包拿走了。
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At the top of the hill you can see the whole city. 在山顶上你能看到全市。
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Then we can put their comments at the top of the advertisement in big print. 然后我们可以把他们的评论在广告上方用大字号刊出。