从海平面到约4000米的大气层部分,该范围内无需技术辅助即可呼吸
ecospheres — plural of ecosphere
从海平面到约4000米的大气层部分,该范围内无需技术辅助即可呼吸
The portion of the atmosphere from sea-level to about 4000 meters in which it is possible to breathe without technological assistance.
生物圈
The biosphere.
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