The researchers first tried out their device on gas emissions from Nicaraguan craters in 2000.
研究人员于2000年首次试验这种装置,用以侦测尼加拉瓜的火山口排出的气体.
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因而,地图上还有许多疑似陨石坑的地貌构造, 还须进一步调查求证.
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To infer, the Guangzhou city belongs to the spread area of probable meteorite craters.
据此推测, 广州市区属疑似陨石坑分布区.
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The eruptions were associated with the development of a number of giant craters ( calderas ).
随着火山爆发形成了多个大火山口 ( 破火山口 ).
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