The Sheffield investigation, which involved sixteen primary schools and seven secondary schools, found that most schools succeeded in reducing bullying.

谢菲尔德的调查涉及16所小学和7所中学，结果发现大多数学校都成功地减少了校园欺凌行为。

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In this research study, I together with the students of secondary school students were deep into the subject Starchaser investigation.

在这次课题研究性学习中，我与同学们一齐对中学生追星题目进行了深进调查。

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Researchers usually start their investigation by examining secondary data to see whether their problem can be partly or wholly solved without collecting costly primary data.

调研人员开始调查时总是先收集次级资料以判断问题是否部分或全部解决了，而不是先去收集成本很高的初级资料。

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Rushing to the scene, he identified the dead animal as a rat and started what he called a "secondary investigation" to ascertain whether Beastly's find was a one-off.

WSJ: In Alberta, Citizens Smell a Rat After Long-Banned Rodents Appear