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For weeks he had worried over how to convince the graduates that they, too, could succeed

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If the Chinese people work hard, they can definitely attain this grand strategic objective.

食品中最大的危害源是微生物污染和食品添加剂使用。()

Such crashes are the second-leading cause of death for migrating birds, after habitat(栖息地loss, with an estimated number of death ranging up to a billion a year.

油炸食品的安全问题主要是由于油的反复使用导致脂肪酸的氧化，与油的温度无关。()