... protractor 分度规 proving flight 验证试飞 proving ground 试验场 ...
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route-proving flight 试飞
route-proving flight schedule 航线试验飞行顺序表
But at the halfway stage of his first season back in top-flight racing in nine years, Neil Hodgson admits it is proving a much taller order than he expected.
BBC: Neil Hodgson
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