分析指出，该飑线系统是由高空槽前型的上干下湿引起的不稳定强对流天气。

The squall line is a kind of instable and strong convective weather caused by the air with upper-layer dry and lower-layer wet in front of the upper-troposphere trough.

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例如，亚里斯多德在公元前三世纪曾有一个研究型图书馆。

For example, Aristotle once had a research library in the third century B.C..

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与我交谈的农民仅十年前还在从事仅能糊口的自给型农业。

I spoke to farmers who only ten years ago barely made ends meet as subsistence farmers.

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