They have failed to carry out their obligations under the contract.
他们没有按照合同履行自己的义务。
Some obligations under the contract cannot be performed owing to force majeure.
由于不可抗因素，合同下的一些义务不能得到履行。
Some obligations under the contract cannot be performed owing to force majeure .
当事人迟延履行后发生不可抗力的，不能免除责任。
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