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手を打つ， てをうつ
1. to take (preventive) measures
2. to come to an agreement (in bargaining, etc.), to strike a bargain
3. to clap one's hands together
采取（预防性）措施
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
