德国航空航天中心和德国汉莎航空公司都宣布周日进行试飞，以测试火山灰的聚集情况。
The German Aerospace Center and Lufthansa both announced test flights for Sunday to measure the ash concentration.
德国航空航天中心和德国汉莎航空公司都宣布周日进行试飞，以测试火山灰的聚集情况。
The German Aerospace Center and Lufthansa both announced test flights for Sunday to measure the ash concentration.
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