你思考的方式越是目标导向，索引就会越好地与用户寻找某物时最可能浮现在他脑海里的事物匹配。
The more goal-directed your thinking is, the better the index will map to what might possibly pop into a user's head when he is looking for something.
现在，虽然他不打算去想他，但关于他的记忆却不断地浮现在他的脑海里。
Now, though he did not intend to think about him, memories of him constantly drifted into his mind.
当人们想起萝卜，通常浮现在他们脑海里的画面是一种瘦长的橙色的植物。
When people think of carrots, they usually picture in their mind a vegetable that is long, thin and orange.
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