Break a promise
Break A Promise(负约), 此释义来源于网络辞典。
breach a contract
... bank breach 决堤 breach a contract 负约; 违约,背约 breach a wall 在墙上开破口 ...
break an agreement
break an agreement 负约; 违约, 破坏协定; 违约,背约 claim for breaking an agreement 违约赔偿 .
nonnegative constrains
NNLS ; NCLS
Credit Default Swap ; CDS