词汇“principal group”用英语简单造句子的方法、技巧、例句及翻译-英语例句辞典

单词	principal group
例句	DEFINITIVE EXAMPLES 权威例句〔major league〕Either of the two principal groups of professional baseball teams in the United States.棒球联合总会：美国两大全国性职业棒球联合会之一美国传统
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