原题: the underlying physical principles that control the midair gryration of divers and gymnasts are the same as (those controlling the body orientation of)astronauts in a weightless environment. 括号的部分,是练习中的正确答案,但是我不理解为什么是controlling? 主句中的谓语是control,那么比较之后是不是也应该是those control呀?