preventtodosth与preventsb（from）doing⽤法
prevent to do sth
如： Do not water in before making a turn every time 9 days, make wilting of its branch appreciably, make branch the turn slowly next,prevent to break off or cause \"dead turn\" . 在每次作弯前⼀两天不要浇⽔，使其枝条略微萎蔫，然后将枝条慢慢作弯，防⽌折断或造成“死弯”。
prevent sb (from) doing sth
等同于stop ···from 或 keep···from (from为介词，后加ing) 阻⽌，预防某⼈⼲某事如:l prevent him from going out.我阻⽌他出去。
