Rather than a regulatory system with uniform effluent limitations, it may be preferable to have a variable standard that would concentrate pollution abatement where it costs the least.

制定各种各样的花费成本最少而又达到减污效果最佳的可变标准或许是最好标准，而不是统一的污染限制管制体制。

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If this environment variable is not set, then the debug messages are written to standard output.

如果没有设置这个环境变量，那么调试消息被写到标准输出。

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These use the LD_PRELOAD environment variable to preload a library that replaces the standard memory routines with instrumented versions.

这些工具使用LD _ PRELOAD环境变量预加载库，用于将标准内存例程替换为插装版本。

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All were former Abbey customers, who were put on standard variable rate (SVR) mortgages after coming off fixed-rate deals.

BBC: abbey

Current borrowers revert to a standard variable rate (SVR) of just 2% above bank rate, so currently paying 2.5%.

BBC: Lloyds raises standard mortgage rate for new borrowers

Nationwide's chief economist Martin Gahbauer said lower interest rates had given existing homeowners with tracker or standard variable mortgages a welcome breathing space.

BBC: House prices 'continue to rise'