- 实行: carry out; put into effect
- 约言: promise; word; pledge
- 约言: promise; word; pledge 实行约言 redeem one's pledge; 违背约言 break one's promise; go back on one's word; 遵守约言 be true to one's promise
- 约言之: in a word indistinct
- 可行约束: feasible constraints; feasible restriction
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