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届く， とどく
1. to reach, to touch, to get to, to carry (of sound)
2. to be delivered, to arrive
3. to be attentive, to be scrupulous, to be thorough
4. to be realized (of a desire), to be fulfilled, to get through (to someone), to be appreciated, to make an impr...
到达；触碰；终于……按时……；传播(声音)；即将交付，即将到达；专注，严谨，全面细致；(愿望)得以实现、得以满足；(某事)得以完成；(给某人)留下印象、得到赞赏；给人留下深刻印象
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はず， 筈， 弭
1. should (be), bound (to be), expected (to be), must (be)
2. nock (of a bow)
3. nock (of an arrow)
4. nock-shaped grip (between thumb and forefinger)
5. wooden frame on the tip of the mast of a Japanese ship that prevents the hawser from falling out...
应该（是），必须（是）
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
