急!帮忙用英语翻译几个简单句子

It allows us to obtain new knowledge and access to new resources. The expansion of human survival in space. But costly. Threat to the safety of astronauts.

It can make us get new knowledge and new resources and also can expand human·s living space 。But the cost is too high and post a threat to astronauts。

it can make us get new knowledge ,get new resource,and widen human's living space, but it will cost much and threaten astronauts' safety

it can make us get new knowledge ,get new resource,and widen human's living space,.