互动封闭仿真课堂
1、智能交互 2、电子板书式视频教学 3、在线互动问答 4、封闭课堂启发式教学方式
随堂测试、知识梳理、易错点揭示、总结启迪智能错题本
听课中的错题能自动加入错题本，课后可方便复习及导出错题本升级服务
在线答疑、课后同类题练习、讲义下载、短信提醒He has been lacking in energy for some time. (他感到虚弱有段时间了。)
He feels drowsy, dizzy and nauseated. (他觉得昏昏欲睡，头晕目眩和想吐。)
He feels as though everything around him is spinning. (他感到周围的东西都在打转。)
He has noticed some loss of hearing. (他发觉听力差些。)
She has some pains and itching around her eyes. (她眼睛四周又痛又痒。)
(2) 伤风感冒：
He has been coughing up rusty or greenish-yellow phlegm. (他咳嗽带有绿黄色的痰。)
His eyes feel itchy and he has been sneezing. (他眼睛发痒，而且一直在打喷嚏。)
He has a fever, aching muscles and hacking cough. (hacking = constant) (他有发烧，筋骨酸痛和常常咳嗽。)
He coughed with sputum and feeling of malaise. (malaise = debility) (他咳嗽有浓痰，而且觉得很虚弱。)
He gets a cold with a deep hacking cough. (他伤风咳嗽。)
He has a headache, aching bones and joints. (他头痛，骨头、关节也痛。)
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