如果为卸载作业选择Conversion模式，则可以创建格式、映射、过滤器等。

If Conversion mode is chosen for the unload job, then you can create format, map, filter, and so on.

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19岁的萨琳娜·哈珀是弗吉尼亚理工大学的一名学生。2015年，她刚开始上大学的时候，面临着一个两难的选择：要么交房租，要么花钱交化学作业。

Sarina Harper, a 19-year-old student at Virginia Tech, was faced with a tough dilemma when she first started college in 2015 — pay rent or pay to turn in her chemistry homework.

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但因为它全是数字化的，它消除了二手书市场，也消除了任何共享，而且因为作业和考试都是通过准入码进行的，它消除了任何选择退出的能力。

But because it's all digital, it eliminates the used book market and eliminates any sharing, and because homework and tests are through an access code, it eliminates any ability to opt out.

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They're not due--the first one's not due until next Monday or Wednesday, so you can pick any three days to do it during that period of time.

第一份作业的截止日期是下周一或三,因此你可以任意选择三天来记录饮食

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

They choose not to work the homework.

他们选择不做家庭作业。

麻省理工公开课 - 固态化学导论课程节选