这样做是为了限制数据量并使用较小的内存，使我们的系统可持续性成长。

This is done to limit the amount of data and use less memory, which adds up as a system continues to grow.

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在2008年，这信息已经成长为一个全球可持续性的互动，甚至有5千万户家庭的灯关掉一小时。

In 2008 the message had grown into a global sustainability movement, with 50 million people switching off their lights.

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在2008年，这信息已经成长为一个全球可持续性的互动，甚至有5千万户家庭的灯关掉一小时。

In 2008 the message had grown into a global sustainability movement, with 50 million people switching off their lights.

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