对食品添加剂进行了严格的安全检测。
在飞行过程中，它达到了3000英尺的高度并在一个安全的区域内进行了一系列轻巧的转弯。
During its flight, it reached 3,000 feet and performed a series of gentle turns all over a safe area.
该总统在电视上为严格的新安全措施进行了辩护。
The president has gone on television to defend stringent new security measures.
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