在2008年，我从没有在上山时跑过，所以我觉得没有必要训练向山上跑。
I never ran uphill in 2008, so I decided that I shouldn't practice running uphill in my training.
所以完全没有必要担心你的健康会变差，训练会落后，或者产生自己根本不适合跑步这样的念头。
So don't worry that you're losing fitness, falling behind in your training, or that you're just not cut out to be a runner.
进行这项培训会议上，你可能会想用警犬训练衣领，但它是没有必要的。
For this training session, you might want to use a dog training collar, but it is not necessary.
因此，如今已经没有必要争论听力训练在英语语言课中的重要性。
So it is unnecessary to argue the importance of listening training in English language classes.
狗主往往认为，一旦狗受过训练，便没有必要继续进行。
Keep training. Owners often think that once a dog is trained, there is no need to carry on.
狗主往往认为，一旦狗受过训练，便没有必要继续进行。
Keep training. Owners often think that once a dog is trained, there is no need to carry on.
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