中文版：为[学科]《[课题]》的课堂设计过渡语。从导入到新授、新授到练习、练习到小结，每个环节之间要有自然的衔接。给5句过渡语，语言简洁，适合[年级]学生。

英文版：Design transition phrases for a [Subject] '[Topic]' lesson. From lead-in to presentation, presentation to practice, practice to summary. Give 5 transition phrases, concise, suitable for [Grade] students.

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