He hastens to add that individual actions cannot be a substitute for the policy changes needed to curb emissions and promote clean energy.

他接着补充，个人的行动并不能取代政策的改变，而这些政策能促进温室气体排放的减少和清洁能源的开发。

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But while the Python interpreter is running an application, Psyco sometimes checks to see if it can substitute some specialized machine code for regular Python bytecode actions.

但是当Python解释器运行应用程序时，Psyco会不时地检查，看是否能用一些专门的机器代码去替换常规的python字节码操作。

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