The overall cost of entry — taking into account the cost of training needed only a decade ago and now no longer necessary — has not so much dropped as evaporated.
考虑到十年前你还需要花费受训费而现在那已经不需要了，网络的入场费就像被蒸发掉一样，所剩无几。
Hiking requires no special skills but suitable training and preparation are necessary for the hikers to cope with the many-fold changes and prevent misfortunes from happening.
虽然远足并不需要特别的技巧，但如果有适当的训练和准备将有助应付大自然多端的变化，和减少意外发生的机会。
No productive employment is allowed unless it is incidental and necessary to the training.
除非是偶然发生或是培训需要，否则不允许提供任何获益性的工作。
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