This phase began in the 1920s - and has lasted throughout the space age.
这一阶段开始于20世纪20年代，并持续了整个太空时代。
The reasonable design age was put forward based on the intensity phase of lime-flyash soil.
依据二灰土强度增长的阶段性，提出了合理的设计龄期。
The reasonable design age was put forward based on the intensity phase of lime-flyash soil.
依据二灰土强度增长的阶段性，提出了合理的设计龄期。
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