保持和有必要的的英文保持keep,mantain有必要necessarykeeptokeep(up);tohold;toretain;tomaintain；topreservetobenecessary{0}2，保護允許有必要的遵守英語單詞怎么寫保護-Protect允許-permit/allow有必要的-necessary遵守-abide/follow保護Protection;允許Allow;有必要的necessary;遵守complywith。保護；允許；有必要的；遵守Protection;Allo...