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寸前， すんぜん
1. just before, on the verge of, on the brink of
2. just in front of, just ahead of
之前，即将……之前；就在前面，就在前方
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
