Private ownership of elements is the indispensable but not the mere condition of exploitation.
要素私有权是剥削的必要条件,但并不是剥削的充分条件。
Some of them were encouraged with the reward of a sticker, others with the reward of verbal praise, while the remainder received no reward (a mere exposure condition).
部分是用贴纸作为奖励,另一些则是口头鼓励,而剩下的则没有奖励(只是给他们看到这些蔬菜)。
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