当我们无法妥善处理，事情只会越积越多，使我们的生活变得杂乱无章。
When we can't let go of anything, it all just piles up and creates a mess in our lives.
最初的几个周六下午，你会在积灰的货架之间来回踱步，随心地细细品读一页或一章，或者翻动胡乱堆在角落里和桌子上的小东西。
You spend your first couple of Saturday afternoons ambling round among dusty shelves, savouring a page or a chapter as you please, or fingering the piles of oddments that litter counters or tables.
点积和矩阵。阅读第三章至3.7以及做练习题。
The dot product and matrices. Read Chapter3 through3.7 and do exercises.
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