The tasks have been ranked in order of difficulty.
按照困难程度对工作进行了分类。
While this approach might seem to be out of order, the editor posits that it might be in order of difficulty.
尽管这种方式的顺序看起来有些不合常理,但编辑假定这可能是按照困难程度来安排的。
The basic idea of this method is to increase the % of your body weight that you use in order to increase the difficulty.
这种训练方法主要是在训练中通过加大所用的体重来逐步增加困难级别。