咖啡是有兴奋作用的饮料。
晚上六点之后尽量避免喝有兴奋作用的饮料，比如可乐、咖啡、茶之类的，睡前的一个小时内不要看电视，也不要去查看你的邮件——去听听古典音乐或是舒缓的CD。
‘Avoid stimulating drinks such as cola, coffee and tea after 6pm, and don’t watch TV or check emails during the hour before bed — try listening to classical music or a relaxation CD.’
此波不易产生适应，能提高肌肉组织的兴奋性，对横纹肌有良好的刺激收缩作用。
This kind of wave may increase the excitability of muscular tissue and have a fine stimulative and contractive effect on the striated muscle.
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