It says that the function must be used in an expression involving the comparison operation and that the search method "equals" of the index extension hash_index is referred to.

这说明，该函数必须在一个涉及比较操作并且引用了索引扩展hash _ index的搜索方法“equals”的表达式中使用。

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Methods MRI features of 37 cases with hepatic echinococcosis proved by operation and pathology were analysed in comparison with that of CT.

方法分析37例经手术病理证实的囊型肝包虫病的MRI征象并与CT结果对照分析。

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In comparison with the current discretization finite element method, the present method has the merits of easy data input, quick operation and storage saving in computer analysis.

本文方法与现有的离散化有限元法相比，具有输入数据简单，运算速度快，大量节省计算机内存的优点。

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However, although this is significant when assessed in the light of a very minor operation, the extra risk is very small in comparison to the higher overall risk of major surgery like a heart bypass.

BBC: Heart bypass - with local anaesthetic

John Erickson makes something of the comparison between the great tsarist offensive in 1916 under Brusilov and Zhukov's operation in 1944 to clear the Germans from Belarus, showing in the process that the armies of both wars were not the primitive, poorly led, forces often depicted in western literature.

ECONOMIST: 20th-century history

The US president said that many doubts were expressed about the operation by those who knew about it, because of the greater perceived risks in comparison with other possible methods such as air strikes, but that he welcomed this openness.

BBC: Bin Laden raid: Barack Obama describes 'huge risks'