卖方违约 Seller's Default

支付乙方违约金 Pay Party B liquidated damages

买方违约 Buyer's Default

双方违约 Bilateral breach

违约方 party in breach ; default party

划船游乐方面的违规 boating infractions

甲方的违约责任 Party's breach of contract

方案违背 protocol deviation

双方都违反合同 bilateral breach

追究甲方的违约金 Pursue party a breach