论述了稀散元素钪在自然界中的分布、应用状况及提取技术。
The distribution in nature, application, and extraction technology of scandium are introduced.
添加这两个新实现的好处是散列集合现在可以维护贯穿其元素的两条路径。
The advantage of these additions is that a hashed collection now maintains two paths through its elements.
那么在给定的程序中，被用作键的元素类型和存储在散列表中的值类型，将不能是任意对象。
In a given program, the types of elements we use as keys, and the types of values we store in the hashtable, will not be arbitrary objects.
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