He pretended to fall over.他假装跌倒.When they fall over, they slide a long way down the hill!当他们落下时, 就会沿着山坡滑行很长的一段路.They might bump into things bomb intersects or fall over objects.可能会撞上一些东西,或者是在某些东西上面摔倒....
It specifically referenced Hermann Noordung's classic 1928 book on this subject.在这一问题上它特别参照了赫尔曼·诺丁1928年的经典之作。The reader is cross - referenced to the entry " center " .读者可参见 center 词条.Each new volume is thoroughly re...