As feathers became larger over time, flapping flight evolved and birds finally became fully air-borne.

随着时间的推移，羽毛变得越来越大，扑翼飞行逐渐发展，鸟类最终完全可以在空中飞行。

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The improving measures are proposed to make the missile possess a certain adaptive ability avoiding the failure of missile flight test when the missile borne radio altimeter is out of order.

提出了弹上无线电高度表因外因导致高度指示异常时，使导弹具有一定的自适应能力，避免导弹飞行试验失败的改进方案。

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At last, combining FSA and IROPE algorithms, using air-borne SAR actual flight data, the algorithms' feasibility and validity are validated.

最后，结合FSA成像算法和IROPE自聚焦算法，以机载SAR实际飞行数据为基础，对算法的可行性和有效性进行验证。

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