Drugs are only approved after tests have demonstrated that they are relatively safe when used as directed and when their benefits outweigh their risks.

药物只有在试验证明它们是相对安全的情况，且其益处大于风险时，才会被批准使用。

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People who study after tests don't graduate.

测试后才学习的人是不会毕业的。

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One of them was later released after tests came back negative.

其中一人在试验呈阴性之后被允许出院。

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After their first tests, the researchers cleaned the water system with chlorine dioxide.

VOA: special.2011.04.06

Their memory improved significantly, so their intelligence level as taking by tests before and after compared to control group improved significantly after a single week.

他们的记忆力有明显改善，他们的智力水平,在实验前后进行测试，再与对照组相比,在仅仅一周后就有明显改进。

哈佛公开课 - 幸福课课程节选

Then,after college, there are graduate admissions tests to prepare for.

VOA: special.2009.09.17

After tests in two different detectors, it was confirmed that the particle possessed those properties.

FORBES: CERN Now Certain It Has Discovered The Higgs Boson

The firm stopped production after tests found 75% horse DNA in an ingredient imported from Poland.

BBC: Newry cold store: Horsemeat not ours

MacLeod was banned after tests revealed high levels of testosterone, which was later attributed to alcohol intake.

BBC: Beattie says Scots behind MacLeod