If you can't think of something, you may be relying too much on external rewards.

如果你想不出来，那你可能就是过度依赖外界的肯定。

He seems listless and confused, and though he still learns new problems without external rewards, his performance is peculiar.

它似乎无精打采，而且有些困惑，虽然仍在没有奖赏的情况下学习新的解题，但表现得相当不寻常。

The first type is extrinsic where people do something because they want to get some external rewards.

第一种类型是外在的， 人们做某事是因为他们想获得一些外部奖励。