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まく， 撒く
1. to scatter, to sprinkle, to strew
2. to distribute (flyers, etc.), to give out, to hand out
3. to shake off (a pursuer, companion, etc.), to give the slip, to throw off, to lose, to get rid of
撒
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なければならない， なければなりません， なければいけない
1. have to do, must, should, ought to
必须，应该
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
