极端体育开始作为选择到更加昂贵的体育。
Extreme sports started as an alternative to more expensive sports.
象所有极端体育，这其中有年龄限制也定在18岁。
Like all extreme sports, this one has an age restriction too, set at 18 years.
甚而有特别奥林匹克为极端体育，称冬天X比赛，包括雪山骑自行车和冰上升。
There's even a special Olympics for extreme sports, called the Winter X-Games, which includes snow mountain biking and ice climbing.
其他诱因可能包括冷空气、愤怒或恐惧等极端情绪激发以及体育锻炼。
Other triggers can include cold air, extreme emotional arousal such as anger or fear, and physical exercise.
其他诱因可能包括冷空气、愤怒或恐惧等极端情绪激发以及体育锻炼。
Other triggers can include cold air, extreme emotional arousal such as anger or fear, and physical exercise.
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