At some point each developer must check his or her code into the source control system to see whether it will work with all the code others have written and checked in.

在某一时刻，每个开发人员都必须将他的或她的的代码检入到源控制系统中，以考察这些代码是否能和其他人编写并提交的代码一起工作。

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The cost control and analysis is the key point to minimize the expense and excavate "the third profits source".

成本控制分析是减低费用、挖掘“第三利润源泉”的重要方面。

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In contrast with point source pollution, non-point pollution is difficult to control and prevent because of its randomicity, intermittence, hysteresis and complexity.

与点源污染相比，非点源污染具有随机性、间歇性、滞后性、复杂性等特点，不易控制和治理。

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But today's problem of non-point source pollution is more difficult to control.

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