These injuries are due to insufficient warming-up exercises, poor sporting proficiency, uneven field, reoccurrence of old injury and exhaustion.
造成运动损伤的主要原因是准备活动不充分、技术水平不高、场地欠佳、旧伤复发、运动疲劳等。
Writing exercises can reinforce and facilitate learners 'english learning and improve their English proficiency as well as their communication ability.
练习写作有助于加强和促进英语学习者的语言学习，提高语言能力以及交流能力。
Writing exercises can reinforce and facilitate learners 'english learning and improve their English proficiency as well as their communication ability.
练习写作有助于加强和促进英语学习者的语言学习，提高语言能力以及交流能力。
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