一、释义不同 1、sustain：vt． 支持；承受；维持；认可；经受 2、maintain：vt． 维持；维修；保养；坚持；断言 3、retain：vt． 保持；保留；记住；聘请 二、引申不同 1、sustain：引申为“...

保全 [词典] save from damage; assure the safe of; maintain; keep in good repair; [例句]众所周知政府中的要员都很会保全自己的利益。 Its always been known that key figures in the government do very well for themselve...