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cd /var/log：()路径。cd ../var/log：()路径。

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．：代表()目录，也可以使用./来表示。．．：代表()目录，也可以用../来代表。

Alzheimer’s is a slow _(1 word) disease of the brain affecting one in ten people over the age of (1 word) .

When more plaques and tangles spread into different regions of the brain, they will ______________________ (5 words) wherever they go.

Hippocampus is the part of the brain where__________________________(4 words).