Sumner would greet us with frowns and grimaces, doing his best to express wordless disapproval...萨姆纳会冲我们皱眉，做苦脸，竭力表示他无言的反对。As the gray Chicago sky frowns outside his conference room window, Obama rehearses his message.芝加哥...
Conclusion: The pit and fissure sealant have significant preventive effect on carious teeth.结论: 窝沟封闭能有效预防窝沟龋的发生.A universal UV sealant to protect all acrylics, wraps and gels.保护所有水晶甲 、 假甲和凝胶甲的常用紫外线光疗密封剂.Conclusion: Fibri...
此项试验为长期有效控制草地害鼠,扩展鼠害防治途径提供了依据.The experiment provides the theoretic base for effectively controlling and preventing the rodent pest.鼠荒地是害鼠破坏草原植被以后形成的次生裸地.Rats wasteland is the secondary bare land of grassland on which ve...