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高齢者， こうれいしゃ

1. old person, elderly person, senior citizen

老人

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について， に就いて

1. about, on, regarding, concerning 2. per, for every

关于

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考える， 勘える， 稽える， かんがえる

1. to think (about, of), to think over, to ponder, to contemplate, to reflect (on), to meditate (on) 2. to consider, to bear in mind, to allow for, to take into consideration 3. to think (that), to believe, to hold (a view), to judge, to conclude, to...

想，思考；考虑

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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

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の

1. indicates possessive 2. nominalizes verbs and adjectives 3. substitutes for "ga" in subordinate phrases 4. (at sentence-end, falling tone) indicates a confident conclusion 5. (at sentence-end) indicates emotional emphasis 6. (at sentence-end, risi...

句尾起强调作用；助词，表示所有关系

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