求翻译：2， 准备活动，充分的准备活动能使关节、韧带、肌肉温度升高，增加身体灵活性，提高神经系统兴奋程度和心血管活动水平，从而防止运动伤害的发生。是什么意思？

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* 2 preparatory activities, adequate preparations, to enable joints, and ligaments, muscle temperature rise, and increase flexibility, improve your body nervous system and cardiovascular activity level of excitement, thereby preventing sports injuries from occurring.

2, The warming-up exercise, full the warming-up exercise to be able to cause the joint, the ligament, the muscle temperature increment, increases the bodily flexibility, enhances the nervous system excited degree and the cardiovascular activity level, thus prevents the movement injury the occurrence

2, preparatory activities, full of preparatory activities to make the joints, ligaments, muscle temperature, increase body flexibility, increase the nervous system and cardiovascular activity levels, so as to prevent injury from occurring.

2, preparatory activities, full of preparatory activities to make the joints, ligaments, muscle temperature, increase body flexibility, increase the nervous system and cardiovascular activity levels, so as to prevent injury from occurring.