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English

In 1931, the US Army Air Corps and General Electric tested a sonic altimeter for aircraft, which was considered more reliable and accurate than one that relied on air pressure when heavy fog or rain was present.

Chinese

1931年,美国陆军航空队和通用电气测试了一款为飞机设计的声波高度计,在雨天或者雾天这款测高仪有着明显高于空气压力高度计的精确度。