求翻译：通过诊断性评价，可了解到学生在以前的教材中，已学过了与Seeing the doctor 话题 相关的单词和句子，如head 、eyes 、hands,、foot 、legs 等身体部位单词及句型 What’s wrong with you ? I don’t feel well . My head hurts. etc.这为学生循序是什么意思？

Through the diagnostic evaluation, can be learned by students in the previous textbooks, has studied the subject and Seeing the doctor related words and sentences, like head, eyes, hands,, foot, legs and other body parts Word and sentence patterns What ' s wrong with you? I don’t feel well . My head hurts. Etc. this gradual Jian for the students into natural language knowledge acquisition of Seeing the doctor, lay a good foundation for language learning.