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その頃， そのころ
1. at that time, in those days, at that moment, then
tbd
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小学生， しょうがくせい
1. elementary school student, primary school student, grade school student
小学生
は
1. indicates sentence topic
2. indicates contrast with another option (stated or unstated)
3. adds emphasis
指示句子的主题；表示与另一选项（无论是否明确提及）形成对比；表示强调
