The quick but incorrect way to remedy the problem would be to eliminate the Leaf class and represent Leaf nodes simply by putting null Pointers in the left and right fields of a Branch.
一种快速但不正确的解决这个问题的方法是除去Leaf类并通过简单地将空指针放在Branch的left和right字段中来表示leaf节点。
If we had added a getValue method to class Leaf, we would either have to return some sort of flag value indicating that the method application is non-sensical or actually throw an exception.
如果我们已经向Leaf类添加了getValue方法，我们要么是不得不返回一些类型的标志值表明此方法应用是无意义的，要么是实际抛出一个异常。
Maple Leaf education concerns not only class teaching, but also development of students' other abilities.
枫叶的教育不仅止步于课堂，还注重其他能力的培养。
George turned over a new leaf and stopped disturbing the class.
乔治已改过自新，不再在课堂上捣乱了。
The paper introduces the stiffness testing method used in automotive circle and the test method of the second class stiffness leaf spring in IVECO automotive leaf spring standard.
介绍了行业中的刚度测试方法和IVECO汽车板簧标准中的二级刚度的板簧刚度测试方法。
The average price and the high class leaf rate were influenced insignificantly by nitrogen rates and density.
氮用量和密度对均价、上等烟比例影响不显著。
Chinese strategic culture is full of supernatural color, it roots in remote antiquity, and its branch and leaf grow in the modern society, which is in a class by oneself in the world history.
中国战略文化充满了神奇色彩，它扎根于远古，但其枝叶却成长在现代社会，这在世界历上中独一无二。
This is a most glorious May Day labor class meetings PPT, with maple leaf as a background, it is very fresh, a detailed description of the origin of May Day, not to be missed!
这是一个关于五一节劳动最光荣的主题班会PPT，以枫叶作为背景，显得非常清新，详细的介绍了五一劳动节的由来，不容错过！
In this class, students take pictures of scenes and figures on our campus. They use their pictures to illustrate our lives at Maple Leaf and to enjoy beautiful memories.
摄影特长班主要是让学生通过深入生活，拍摄校园里的风景、人物等，借此反映枫叶学校的风采，也从中接受美的教育。
According to the 6 one-class districts and 12 second-class districts of flue-cured tobacco leaf planting area general evaluation of the quality of flue-cured tobacco leaf was conduct.
针对目前烤烟种植的6个一级区12个二级区，对其烟叶质量进行了综合评价，并提出了具体的质量改进意见。
According to the 6 one-class districts and 12 second-class districts of flue-cured tobacco leaf planting area general evaluation of the quality of flue-cured tobacco leaf was conduct.
针对目前烤烟种植的6个一级区12个二级区，对其烟叶质量进行了综合评价，并提出了具体的质量改进意见。
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