With a hash index you can find a record in a given file in constant time by generating a hash value for the record and then looking up the record in the file based on that hash value.
借助hash索引,可以通过为记录生成一个hash值,然后根据这个hash值在文件中查找该记录,从而在固定的时间内在给定的文件中找到一条记录。
After reaching a turbulent state, the system continues its evolution which exhibits that the energy spectrum index is not a constant instead of a wide range of changes in time.
模拟中,系统逐渐达到湍流状态,随着系统的不断演化我们发现如下事实:能谱指数随时间并不是不变的,而是在较宽的范围内变动;
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