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Define the following terms.usage notes
【正确答案】：

EXPLAIN THE SLIGHT DIFFERENCE BETWEEN WORDS OF SIMILAR MEANINGS; DIFFICULT POINTS OF GRAMMAR AND STYLE; IMPORTANT BRITISH AND AMERICAN DIFFERENCES 

【题目解析】：本题主要考查词典的用法注释。用法注释说明了同义词间的细微区别、语法和风格上的不同点以及重要的英式和美式区别。