Meanwhile, the author expounded medium preparedness as the most effective level of student preparedness for oral English learning through comparison and contrast.
同时，笔者还通过比较研究，讨论出半准备是对英语口语学习最有效的准备状态。
Conclusion on the basis of routine ultrasonography, dynamic observation through oral infusion of GI ultrasound contrast medium is a simple, non-invasive and effective method of diagnosing CDF.
结论在常规超声检查的基础上，口服胃肠道超声造影剂动态观察的方法简易可行、无创、准确性较高，是诊断胆囊十二指肠瘘的有效方法。
Conclusion on the basis of routine ultrasonography, dynamic observation through oral infusion of GI ultrasound contrast medium is a simple, non-invasive and effective method of diagnosing CDF.
结论在常规超声检查的基础上，口服胃肠道超声造影剂动态观察的方法简易可行、无创、准确性较高，是诊断胆囊十二指肠瘘的有效方法。
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