我加了些词,这样可以方便楼主更清楚成分.其实隐藏了从句的.
They also played special computer games (which is)designed to teach difficult mathematical ideas (which will be )not usually taught until five years later
他们也玩一种特殊的电脑游戏,设计这些游戏的原意是为了训练那种复杂的数学思维,而这种思维一般只会在5年以后才会学到.