最初让我们感到惊讶的是，他们的许多城市并不是建在河边，而是建在地势较高的起伏的高地上。

It initially surprises us that many of their cities were not built next to the rivers but instead on high terrain in rolling uplands.

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实验结果的明确有力让我们感到惊讶。

We were surprised to find such a strong result.

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他在接受一个电话采访时说：“让我们感到惊讶的是变异。”

"What we were surprised at was the variation," he said in a telephone interview.

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