This online Google tutorial will occupy you from 0.5 to 8 hours, depending on how many chapters you elect to skip, and how many of the examples and problems you work through.
取决于你选择跳过多少章节，练完多少例子和问题，该教程可能会花费你半小时到八小时的时间。
In addition to our national organization, many of our members gain support from others like themselves in our 250 local chapters that thrive in communities all across America.
除了我们这个全国性的组织，还有250个地区分会成功地遍布全美，很多会员从与他们一样的会员那里得到帮助。
The book suffers from opening chapters that hop about between time and place a bit too much, and what will strike many readers as a slightly too hurried end.
书中开始的章节时空跳跃的有点多，同时会让读者感到结尾稍微有点仓促。
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