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約束， やくそく

1. promise, agreement, arrangement, one's word, contract, pact 2. appointment, engagement, date 3. convention, rule 4. destiny, fate

协议，合同，约定；约会，订婚；惯例，规则；命运，宿命

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には

1. to, for, on, in, at 2. in order to, for 3. as for, regarding 4. while it is (was) the case that ..., indeed ... (but), certainly ... (but)

tbd

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である

1. be, is

是、=です、=だ

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なくてはいけない， 無くてはいけない

1. cannot do without something, indispensable, absolutely necessary 2. have to do

tbd

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