The life or the effective period of a contract.
一项合约的有效时期或寿命。
Contract plays a very important role in economic life of modern society.
在现代社会经济生活中，合同具有十分重要的地位和作用。
One hundred the contract, the choice of happiness life!
百年好合，幸福一生的选择！
One hundred the contract, the choice of happiness life!
百年好合，幸福一生的选择！
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