天空变得更蓝了，因为我们采取了行动来保护环境。
The sky is much bluer because we have taken action to protect the environment.
这个重达240公斤的机器人被送入天空，用于勘测火星的地形、地理状况，以及水、冰、环境和其他物理场的有关情况。
The 240-kilogram robot was sent into the sky to survey Mars' landforms, geography situation, and something about water, ice, environment and other physical fields.
他设想，未来天空将是这些更加廉价，更易承受并能够随着环境的要求或集体或分散出航的无人机的天下。
The future, he reckons, lies in cheaper, expendable drones that can swarm or spread out as circumstance requires.
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