但是，皮特斯和斯密特说，因为大自然为务农和农业提供了原材料，歌贝克力山丘遗址的建造者正面临着生活方式的巨变。

But, Peters and Schmidt say, Gobekli Tepe's builders were on the verge of a major change in how they lived, thanks to an environment that held the raw materials for farming.

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贝克斯菲尔德高中教师克里斯蒂娜·费罗认为，获得这些材料、培训老师和学生正确地使用都会十分的昂贵。

Kristina Fierro, a high school teacher in Bakersfield, said it would be expensive to get the materials, train the teachers and train the students to use the materials properly.

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在档案和私人收藏中发现了贝克特一万五千多封私人信件，其中不乏很多有价值的材料。

To date, some fifteen thousand letters have been found, and, from that trove, the more pertinent have now been plucked.

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