一个著名的资料来源就曾经引证说一个同步的方法调用比一个非同步的方法调用慢 50 倍。
One well-known source has cited that a synchronized method call is as much as 50 times slower than an unsynchronized method call.
该书给出了非常清楚、具体的英国法律资料信息和如何使用、引证这些资料的说明。
This book gives very clear and detailed descriptions of English legal materials and how to use and cite them.
二者都有精良的索引，包含大量法律引证，每卷都会有年度的补遗以更新资料。
Both are well indexed, contain ample citations, and are kept up to date with annual cumulative supplements to each volume.
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