到了19世纪,瓶装的鸦片酊和生鸦片是很容易得到的。
By the 19th century, vials of laudanum and raw opium were freely available.
另外苹果还是廉价和容易得到的。
对所有技术的培训必须是容易得到的。
And I do that very precisely because it'll teach you a little bit about how easy or difficult it is to do it and what kind of information you retrieve from a dietary assessment.
我这样要求是因为,这能教给你,做评估的难易程度,以及你们能从饮食评估中得到何种信息
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