换言之，XO - 1膝上型电脑中的所有软件都是开源的，因而也都是免费和可修改的。
In other words, all software on the XO-1 laptop is open source and therefore free and modifiable.
它们并不强调个体，因而也允许个体有差异和缺陷。
They don't reckon individuals, so therefore individual variation and imperfection can be allowed.
换言之，大脑的某些关键区域在青少年时期还处在生长发育中，对毒品和酒精的有害影响因而也更敏感。
In other words, key areas of the brain are still under construction during the adolescent years, and are more sensitive to the toxic effects of drugs and alcohol.
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