波音与洛克希德合资的企业“联合发射联盟公司(ula)”，已公开承诺将在四年内准备好。

United Launch Alliance (ULA), a joint venture between Boeing and Lockheed, has publicly promised to be ready in four years.

youdao

波音与洛克希德合资的企业“联合发射联盟公司(ula)”，已公开承诺将在四年内准备好。

United Launch Alliance (ULA), a joint venture between Boeing and Lockheed, has publicly promised to be ready in four years.

youdao