Since the earliest man - powered flights, airframe design has demanded an ever - improving standard of technology.

从最早的人力飞行以来, 飞机机体的设计要求不断地改进工艺质量标准.

辞典例句

Except for the anchor winch, the winches aboard are man - powered.

除锚绞车, 绞车是人力的.

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