These materials should be selected after a careful study and evaluation of the function and requirement of the proposed tool.

应该对所需工具的功能和要求做仔细的研究和分析后才确定选择的材料。

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After a careful study, it is found that: (1) Suspensions created in various shapes such as fiber, plume and dandruff, are constituted of the compounds of metal and non metal;

经研究发现：①悬浮物形态各异，有纤维状、羽毛状或头屑状，由一些金属和非金属化合物组成；

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He said he hoped they would decide on them only after careful study. He asked them to see the proposals as a system of compromise, not as separate bills.

他说，他希望参议员们在经过认真研究之后再作决定，他要求参议员将他的建议作为一个系统，而不是单独的法案来看。

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"The decision to cease publication of the Review is a difficult one made after a careful study of the magazine's prospects in a challenging business climate, " said Todd Larsen, chief operating officer at Dow Jones Consumer Media Group, the Review's publisher.

BBC: News Corp closes Asian magazine