By increasing or lessening the hours of darkness in each day, the scientists have been able to turn plant growth off and on like an electric switch.
用增加和减少每天黑暗小时数的方法，科学家已经能够控制植物生长，如同控制一个电器开关。
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Q: What is your best advice for those who see the film and are inspired to make the switch to a plant-based diet for the first time?
问：对于那些看了这部电影并受到启发要首次切换到植物性饮食的人们，你的最佳建议是什么？
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It calls for Xcel Energy to close four coal-fired units in the region, switch another to natural gas and build a gas-fired plant to help meet federal clean-air standards.