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重ねる， かさねる
1. to pile up, to heap up, to stack up, to put on top of another
2. to repeat many times over, to go through repeatedly, to accumulate
堆积、堆砌、堆放、叠放；重复多次，累积
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
