The contract comes into effect today, we can't go back on our word now.

　　合同已于今日生效，我们不能反悔了

　　Once the contract is approved by the Chinese government, it is legally binding upon both parties.

　　合同一经中国政府批准，对双方就有了法律约束力。

　　We have to hold you to the contract.

　　我们不得不要求你们按合同办事。

　　You must put their rights and interest into a contract.

　　你们必须把他们的权益订在合同中。

　　We always carry out the terms o four contract to the letter and stand by what we say.

　　我们坚持重合同，守信用。

　　It's clearly a breach of contract.

　　这显然是违反了合同。

　　Any deviation from the contract will be unfavourable.

　　任何违反合同之事都是不利的。

　　The buyer has the option of canceling the contract.

　　买主有权撤消合同。

　　You have no grounds for backing out of the contract.

　　你们没有正当理由背弃合同。

　　In case one party fails to carry out the contract, the other party is entitled to cancel the contract.

　　如果一方不执行合同，另一方有权撤消该合同。

　　Are you worrying about the non-execution of the contract and non-payment on our part?

　　你是否担心我们不履行合同或者拒不付款?

　　You cannot cancel the contract without first securing our agreement.

　　如果没有事先征得我们同意，你们不能取消合同。

　　This contract will come into force as soon as it is signed by two parties.

　　合同一经双方签定即生效。

　　Once a contract is made, it must be strictly implemented.

　　合同一旦确定就应严格执行。

　　Words and Phrases

R>
　to bring a contract into effect 使合同生效

　　to come into effect 生效

　　to go (enter)into force 生效

　　to cease to be in effect/force 失效

　　to carry out a contract 执行合同

　　to execute/implement/fulfil/perform a contract 执行合同

　　cancellation of contract 撤消合同

　　breach of contract 违反合同

　　to break the contract 毁约

　　to cancel the contract 撤消合同

　　to tear up the contract 撕毁合同

　　to approve the contract 审批合同

　　to honour the contract 重合同

　　to annual the contract 废除合同

　　to terminate the contract 解除合同

　　to alter the contract 修改合同

　　to abide by the contract 遵守合同

　　to go back on one's words 反悔

　　to be legally binding 受法律约束

　　to stand by 遵守

　　non-payment 拒不付款

　　to secure one's agreement 征得...的同意

　　Additional Words and Phrases

　　contract price 合约价格

　　contract wages 合同工资

　　contract note 买卖合同(证书)

　　contract of employment 雇佣合同

　　contract of engagement 雇佣合同

　　contract of carriage 运输合同

　　contract of arbitration 仲裁合同

　　contract for goods 订货合同

　　contract for purchase 采购合同

　　contract for service 劳务合同

contract for future delivery 期货合同

　　contract of sale 销售合同

　　contract of insurance 保险合同

　　contract sales 订约销售

　　contract law 合同法

　　to ship a contract 装运合同的货物

　　contractual dispute 合同上的争议

　　a long-term contract 长期合同

　　a short-term contract 短期合同

　　contract parties 合同当事人

　　contractual practice/usage 合同惯例

　　contractual claim 根据合同的债权

　　contractual liability/obligation 合同规定的义务

　　contractual income 合同收入

　　contractual specifications 合同规定

　　contractual terms & conditions 合同条款和条件

　　contractual guarantee 合同规定的担保

　　contractual damage 合同引起的损害

　　contractual-joint-venture 合作经营，契约式联合经营

　　completion of contract 完成合同

　　execution of contract 履行合同

　　performance of contract 履行合同

　　interpretation of contract 解释合同

　　expiration of contract 合同期满

　　renewal of contract 合同的续订