科学家们正在研究如何在月球上进行地球化改造，使其适合人类居住。

Scientists are studying how to perform ___terra-forming on the Moon to make it habitable for humans.

科学家们正在研究如何在火星上实施地球化改造以创造适合人类居住的环境。

Scientists are researching how to perform ___terra-forming on Mars to create a habitable environment for humans.