我儿子由于便秘,很难训练他的准时大小便。
My son was having problems potty training due to constipation and this product really helped.
有些软件可以生成一副合成图片,但根据密歇根州立大学的说法,它们的精确度很难与一位训练有素的鉴证素描专家相提并论。
There are a few software programs that generate a composite image, but they can be less accurate than a trained forensic artist, according to Michigan State University.
我们的思维被训练成始终保持分析,实用和汇聚性,所以这个步骤很难做到,但是它至关重要。
We have been trained to be so instantly analytic, practical, convergent in our thinking that this step is very difficult to observe, but it is crucial.
You can train it to flap its wings to escape a situation but it's very difficult to get it to flap its wings for food.
你可以训练鸽子,通过扇动翅膀来脱离某个情境,但却很难通过训练鸽子扇动翅膀来进食。
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