双条件 meaning in Chinese

if and only if

The results indicated that : 1 ) preschoolers ' understanding of conditional promise showed evident developmental progress , which means that most preschoolers can detect peer violation and the rate detecting mom violation and bilateral violation grows with age , among which none 4 - year - olds can detect mom violation and none 5 - year - olds can detect bilateral violation . 2 ) preschoolers ' detection of different violating figure is different , which manifests perspective effect and priority detection for peer violation effect . 3 ) most preschoolers didn ' t understand conditional promise as biconditional
结果表明：幼儿对条件许诺的认知表现出明显的发展趋势，绝大多数幼儿都能指出孩子违反，随年龄增大能指出妈妈违反、双违反的人次百分比逐渐增多，其中4岁组没有人能指出妈妈违反， 5岁组没有人能指出双违反；幼儿对条件许诺中不同角色违背的检测存在“角色效应”和“同侪违背优先检测效应” ;多数幼儿还没有将条件许诺理解为双条件规则。