很少技术性的计算机书籍能够经受住时间的考验；上面提到过的Art of Computer Programming是极少的例外之一。
Few technical computer books have stood the test of time; the aforementioned Art of computer Programming is one of the rare exceptions.
在极少数情况下，如果SQL很少执行或只寻址很少几行，那么调优效果不会明显。
In these rare situations, the results will not be noticeable if the SQL is executed infrequently and addresses very few rows.
在该地区，地方病，尤其是疟疾造成的死亡很常见，很少获得卫生保健，并且死亡的病史档案极少或根本不存在。
In this area, mortality from endemic diseases, especially malaria, is common, access to health care is poor, and medical records of deaths are scanty or non-existent.
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