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555 level—grade—standard
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level的基本意思是“水平（面）”：
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Because of the heavy rain the level of the lake has risen 6 inches．由于大雨湖面上涨了6英寸。
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The town is 2,000 feet above sea level．这座城市海拔2000英尺。
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可以引申表示“水平”、“层”、“级”：
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The general level of the class is high．这个班总的水平是高的。
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This will help to raise our technical level．这会帮助提高我们的技术水平。
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The talks took place at a high level．谈判在高层进行。
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This problem is being considered at ministerial level．这个问题正在部长级考虑。
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Women must have a voice at all levels in the union．妇女在各级工会都应有发言权。
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“等”、“级”也可由grade表示：
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Only the highest grade of goods is sold here．这里只出售最高级的商品。
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These are second grade apples．这是第二等的苹果。
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Radio forecasts said a sixth-grade wind was on the way．无线电预报说将有6级大风。
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grade在美式英语中还可表示“年级”和“分数”：
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An elementary school in America has eight grades．美国的小学有8个年级。
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The play was presented by the third grade．这个剧由3年级演出。
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The boy got a grade B in the spelling test．在拼写测验中这个男孩儿得B。
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She got a grade of seventy-nine on the test．测验她得了79分。
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水平也可由standard表示：
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The school has a high academic standard．这所学校学术水平很高。
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The people of the USA have a high standard of living．美国人民有很高的生活水平。
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His work this week hasn’t been up to his usual standard．他这星期的作业没达到他通常的水平。
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standard还可表示“标准”：
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This food is below standard．这种食物没达到标准。
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