Pulling the single rope would produce the identical food reward, but only with the help of another child or chimp in the room next door, who had to pull the opposite end of the rope at the same time.
只有在另一个孩子或者猩猩的帮助下，同时朝着绳子反方向的一端拉，才能得到相同的食物。
2
A gray car was pulling away from the opposite curb to join the steam of traffic bound for the city.
一辆灰色的汽车离开了对面的路边，加入到城市交通拥堵的车流里。
3
The upper and lower rings have opposite charges, which allow the motor to contract and release, alternately tugging at the DNA like a ring of hands pulling on a rope.