| 单词 | professional course |
| 例句 | DEFINITIVE EXAMPLES 权威例句〔polish〕Polish up your writing skills on a one-week professional course.上为期一周的专业课，提高你的写作技能。柯林斯高阶〔polish〕Polish up your writing skills on a one-week professional course.通过上为期一周的专业课来提高你的写作技能。外研社新世纪 |
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