凯文惊讶于约翰如何把通常很难的数学作业解释得如此简单。
Kevin was amazed how John explained the usually very difficult math homework and made it look so easy.
我叫拉尼凯·文，毕业于英语专业。
最后供职于糖尿病和消化及肾病国家研究所的凯文·霍尔和他的同事们得出：粮食浪费要比前几年的估算高出25%.
The result, from Kevin Hall and colleagues at the National Institute of Diabetes and Digestive and Kidney Diseases, is about 25 percent higher than similar estimates made in recent years.
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