在几年前，大多数经济学都认为，穷国资助美国赤字的壮观景象是美国人肆意挥霍所产生的不正常也不可持续的结果。
A few years ago most economists argued that the spectacle of poor countries bankrolling America's deficits was the perverse and unsustainable consequence of American profligacy.
在传统的生物学实验中，显微镜的操作和使用是一个难点，因为学生很难真正看到微观世界下的景象。
In the traditional biological experiments, it is very difficult for students to have hands-on experience of, for microscopes are not really available.
在传统的生物学实验中，显微镜的操作和使用是一个难点，因为学生很难真正看到微观世界下的景象。
In the traditional biological experiments, it is very difficult for students to have hands-on experience of, for microscopes are not really available.
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