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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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あてにならない， アテにならない， 当てにならない
1. unreliable, undependable, untrustworthy, not to be counted on
tbd
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
