Hiccup was still pretty certain, knowing dragons as he did, that yelling was the easiest method of training them.

卡嗝仍然非常肯定，像他这样了解龙的人，大声叫喊是训练它们的最简单的方法。

Apart from any moral considerations this is a stupid method of training, for it produces a resentful animal who at a later stage may well turn man-killer.

且不说道义问题，这本身就是一种愚蠢的训练方法，因为这种方法训练会使动物反感，在以后某个时期可能会变成伤人的动物。