我还觉得，老师不布置作业，不批阅作业，不评讲作业，也是缺德的。
In my opinion, it is also immoral for teachers not to give assignments, not to read over them or not to assess them.
如果不这样做，它们就有可能受到增长乏力品牌的拖累，并得到投资者的差评。
Without it, they are in danger of being trapped with low-growth brands and being rated poorly by investors.
相反，肿瘤中大部分的细胞没有这种表面蛋白，生成新肿瘤的能力也很弱。 评：从上下文来看，相反这个词不恰当。
By contrast, the cells that comprise the bulk of most tumours lack these surface proteins and are poor at creating new tumours.
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