Practice is the crucial link of document retrieval course and the subject selection is the essential of practice effect.

实习是文献检索课的关键环节，实习课题的选择是实习效果好坏的关键。

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Problem is the start point of scientific research work, and subject selection is the first step of the whole scientific research procedures.

问题是科学研究的起点，选题是科学研究全过程的第一步。

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The criterion which is used to judge an editor who is competent or not is whether he or she can appreciate the subject selection, authors and works exactly.

判断一个编辑是否称职的标准和尺度，就是看他是否能够对选题、作者、作品做出准确的识鉴。

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Rather than a traditional trial setup, his patients pay tens of thousands of dollars for the privilege of participating in the studies (not the most ethical or effective subject selection strategy).

FORBES: A Film Producer, A Cancer Doctor, And Their Critics

The explanations, particularly in the thorny field of quantum physics, are excellent, and the selection of subject matter skilfully winnows a vast field.

ECONOMIST: History of science: Time's arrow | The

What they have found is that about 1, 800 protein-coding genes, some 7% of the total known, show signs of having been subject to recent natural selection.

ECONOMIST: Human evolution