... 很精致，很精巧，小巧玲珑 exquisite 很精确界定 be most precisely defined 算得很精确 cut things fine ...
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In general, the tests work most effectively when the qualities to be measured can be most precisely defined.
一般来说，当所要测定的特征能够精确界定时，测试效果最佳。
In general, the tests work most effectively when the qualities to be measured can be most precisely defined and least effectively when what is to be measured or predicted can not be well defined.
一般说来，当需要测量的量能够准确界定时测试工作将更加有效，而当需要测量或预测的量不能被很好的界定的时候，测试工作就没那么有效了。
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