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.
2006年年末时，我们曾试图寻找一个现代的在线语言学习工具，让我们感到惊讶的是，当时还没有一个像Babbel这样的工具。
In late 2006, when we were looking for a modern online language learning tool ourselves, we were amazed that nothing like Babbel existed.
2006年年末时，我们曾试图寻找一个现代的在线语言学习工具，让我们感到惊讶的是，当时还没有一个像Babbel这样的工具。
In late 2006, when we were looking for a modern online language learning tool ourselves, we were amazed that nothing like Babbel existed.
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