四足动物的脖子通常很长，这样它们就可以毫不费力地够到食物，但是大象的脖子很短，这样它就可以更容易地支撑它巨大的头和沉重的牙齿的重量。
The neck of four footed animals is usually long, to have them reach their food without difficulty, but the elephant has a short neck, to make him more easily support the weight of his huge head and heavy teeth.
对于电子邮件来说这很容易：只要不把旧邮件删除，使用过滤器就能毫不费力的做到。
This is easy with email: just make sure never to delete old emails, and use filters for effortless organization.
如果精神科医生为病人治疗时增加像太极这样的锻炼，这并不费力，很容易去做，这将是一件很有益的事情，而不是给病人增加服药。
A. “If a psychiatrist were to add exercise like tai chi, which is very nondemanding and easy to access, that would be a very beneficial thing instead of adding another drug.
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