not to fulfil that duty is a crime, is treason.
不履行义务就是犯罪，就是叛徒。
the right to take another's property if an obligation is not discharged.
如果债务人不履行义务而滞留其财产的权利。
The party who fails to perform must give notice to the other party of the impediment and its effect on his ability to perform.
不履行义务的一方必须将障碍及其对他履行义务能力的影响通知另一方。
an inofficious testament [ will ]
不履行道德义务的遗嘱
redeem one's pledges, obligations
履行誓约、 义务.
The trustee has a duty to act in person and not to delegate to others.
受托人有亲自履行的义务，并不得转托他人履行。
release sb from a promise, duty, undertaking, etc
不要某人履行诺言、 尽义务、 承担任务等
Justice: Wrong none by doing injuries, or omitting the benefits that are your duty.
正义：不提损人利己，履行应尽的义务。
We'll never fail to meet our obligations [commitments].
我们绝不会不履行我们（承担）的义务。
We have never failed to discharge our obligations.
我们从来没有不履行我们的义务。
Unless you fulfil your obligation, you leave me with little alternative but to claim for compensation.
除非你履行义务，不然我只好索赔了。
He often welshed on his promises.
他过去经常逃避义务，不履行诺言。
performance obligations
履行偿付债务的义务
(vi) If the party responsible for the expenses of performance was not clearly prescribed, the obligor shall bear the expenses.
（六）履行费用的负担不明确的，由履行义务一方负担。
To commit(money, for example)in order to fulfill an obligation.
承担（如，钱）以履行义务
perform one's contractual oBligations.
履行合同规定的义务
Perform all obligations and liabilities
履行所有责任和义务
Where a party failed to perform or rendered non-conforming performance, thereby causing loss to the other party,
当事人一方不履行合同义务或者履行合同义务不符合约定，给对方造成损失的，