高速列车的引进带来了另一个积极因素。

There was another positive element that resulted from the introduction of high speed trains.

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但美国的政客们对引进技术会带来安全问题实在是在了解了。

But American politicians know all too well that security concerns about imported technology are sometimes justified.

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因此几乎可以肯定的是，正是殖民者引进的植物的球根带来了蚯蚓。

So, almost certainly, did the rootballs of plants that the colonists imported.

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