The surest way we can guard ourselves against the threat of impacts from space is to leave earth and become a spacefaring civilisation .
我们能保护自己抵御来自太空冲击威胁的最可靠办法是离开地球,形成一个航天文明社会。
Populations all around the world can be grateful that health officials are recommitting themselves to primary health care . This is the surest route to greater equity in access to health care .