People should have supplies of water and food at home and at work, which is especially necessary in possible occurrence of an earthquake.

人们应该在家里和工作地点储备些水和食物，这在可能发生地震时时特别必要的。

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Petroleum system as a geological unit to control oil and gas generation and occurrence has been universally accepted by oil and gas geologists both at home and abroad.

成油气系统作为控制油气形成与赋存的地质单元，其概念已为国内外油气地质家普遍接受。

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The occurrence of Avian Leukosis Virus-J Subgroup on the Commercial layer of Roman reported was the first time at home and abroad.

商品代罗曼蛋鸡发生禽J-亚群白血病的报道在国内外尚属首次。

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