Based on experimentations, the penetrability in core with sand proof layer is good to meet the need of high production of the oil well when the porosity of sand proof reaches 39.
基于1个网页-相关网页
reaches 39
达到39
以上为机器翻译结果，长、整句建议使用 人工翻译 。
In 2008 there were only 39, 214 inhabitants left and, according to predictions, this number will continue to fall until it reaches 30, 000.
到了2008年，居民只剩下39,214人，而且据预计，人口会继续下降，直到最后只剩下30,000人。
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It covers some 39, 000 hectares and reaches an altitude of 2, 350 meters above sea level.
UNESCO: Natural Sciences
CNN: Born in the east, young Germans still forced to head west
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