In Unit 4 you will be expected to write simple, compound and complex statements. You will have less help than you had in the previous Units.

在第4单元，要求你会写简单句、并列句和复合同。和前几个单元相比，你所能得到的帮助更少。

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For instance, if you want to subdivide each of the two grids in the previous listing into two units where one unit is twice as wide as the other, you write the code shown in listing 10.

举例来说，如果您希望将之前清单中的两个网格继续划分为两个单元，其中一个单元是另一个单元的两倍宽度，可以编写如清单10所示的代码。

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Conveyers and robots take the evolving computer from station to station; each unit arrives in front of a worker a split second after she has finished with the previous one.

输送机和机械人把装配中的电脑从一个车间输送到另一个车间；工人刚完成她面前的一组半成品，瞬间又有一组送到她的面前。

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Continuing the upward trend of pre-paid phones, in Q4 2012 pre-paid phone unit sales increased 139 percent over the previous year.

ENGADGET: NPD: Apple tops Q4 US smartphone sales, Samsung a strong second place

Total mobile phone unit sales increased 24 percent in Q4 2012, compared to the previous year with smartphones increasing by 52 percent and feature phones declining by 31 percent.

ENGADGET: NPD: Apple tops Q4 US smartphone sales, Samsung a strong second place

Professor Valerie Beral, who is head of Cancer Research UK's Cancer Epidemiology Unit in Oxford, said this study was in line with previous research, although the figures differed.

BBC: Pill increases breast cancer risk