履行合同

jiàn zhù shāng wèi néng lǚ xíng hé tong zhōng guī dìng de yì wù

建筑商未能履行合同中规定的义务。

The builders failed to meet their contractual obligations.

shuāng fāng dāng shì rén jūn bù lǚ xíng hé tong

双方当事人均不履行合同。

Both parties failed to perform the contract.