Design by contract avoids extra code and improves performance, as long as all clients of a class abide by the contract.

契约式设计避免了额外的编码并提高了性能，只要所有的客户都遵守契约。

youdao

If the other party demands continued performance of the contract, the breaching party shall continue to perform.

对方要求继续履行合同的，应继续履行。

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So far 55 schools have opened: 32 charter campuses, 19 performance schools and four contract schools.

目前已有55所学校相继开学，其中32所为特许学校，19所业绩学校和4所合同学校。

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The "charter" is a performance contract.

VOA: special.2010.01.21

She negotiated a new labor contract that measures teacher success based in part on student performance.

VOA: special.2010.10.21

The city would not have been able to afford to replace the equipment without the Energy Savings Performance Contract.

FORBES: Ameresco Revenues Fall Off Fiscal Cliff

In a performance contract, the ESCO guarantees energy or financial savings for the project, which means ESCOs only make money if the project performs as promised.

FORBES: Energy Services Sector Sustained by "MUSH" Markets

The North America segment continued its strong performance with contract sales up 13% and volume per guest up 19%.

FORBES: Marriott Vacations: Timeshare Stock Rocks Since September