They sustained this dense settlement through raised field agriculture, a technique that improved drainage and recycled nutrients in the poor tropical soil.

高地农业技术可以改善贫瘠的热带土壤的排水和养分的循环利用。

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But some scientists in recent months have raised questions about the field.

但是有些科学家最近几个月中就此提出疑问。

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"I believe the work has raised a lot of interesting questions and that a new field of investigation has been opened up," he says.

“我相信这项工作已经衍生出了很多有趣的问题，而且一个新的研究领域已为我们敞开大门。”他说。

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Barnes raised the field glasses up, lowered them, pursed his lips as if in deep thought, and then said, in a newly formed sarcastic voice, Hell, you missed the whole thing, Lee.

NEWYORKER: The Tree Line, Kansas, 1934

The colossal failure cast a pall over the good cholesterol field and raised questions over whether doctors understand how good cholesterol works.

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Ortiz led off the sixth with his 10th home run, a high and long drive that landed in the raised bleachers in right field.

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