片语
unilateral l contract单务合同
unilateral cancellation of contract单方解约
non-unilateral contract不单方接触
unilateral contract and bilateral contract单务合同与双务合同
bilateral contract and Unilateral contract双方契约与单方契约
contract unilateral单方承担义务的契约
a unilateral contract单方
obligation of unilateral contract单务合同之债