例句
Mr. Reid might not look like the average college student, his hair is definitely grayer . But still Jerry Reid’s age is easy to forget, other UVA students know him as one of their own.
里德先生也许看上去和普通大学生不同,他的头发显然更白。但是里德的年龄很容易就被人忽略,其他学生都把他当作自己人。
noun
1.The SI unit of the absorbed dose of ionizing radiation, corresponding to one joule per kilogram.
‘To calculate the dose equivalent one of the workers would receive in sieverts, you would need to multiply the dose in grays, by the quality factor.’
‘The sievert is numerically equivalent to the gray for electrons and for X-rays irradiating the whole body.’
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