与根对象一样，容器对象旨在维护键的列表并将某个对象与每个键相关联。
Like the root object, a container object is designed to maintain a list of keys and associate an object with each one.
结论：根管治疗的失败与牙位(牙类型和牙位置)、根管弯曲度和钙化度密切相关。
CONCLUSION: the tooth type or tooth position, root curvature and calcification have significantly influenced the outcome of root canal treatment.
结果表明：幼苗的抗旱性与根干重呈显著正相关。
Significant positive correlation coefficient was found between drought resistance and root dry weight.
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