送交者: PhonyDoctorPhD 于 2006-4-03, 19:05:45:

回答: 越到高处越难爬了呗，技术超越自然是越到后来越难办 由 蓝隼 于 2006-4-03, 18:59:45:

Birds don't fly at supersonic speed so their wing's don't
have to be as rigid.

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