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The pledges made independently by key tech companies this year, and the one signed Wednesday, reiterate a lot of promises and initiatives that some tech companies have already been working on. In a blog post published by Google highlighting its commitment to the pledge, the company lists several ongoing initiatives, including investments in nuclear and geothermal energy as well as agreement frameworks with electric utilities and pledges to invest in job creation.
，这一点在谷歌浏览器【最新下载地址】中也有详细论述
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Bren Pierce with Kinisi's KR1 robot, fitted with pincers and suction cups
Optical-based smoke alarms use light instead. They are slightly better at detecting the large smoke particles created by slow, smouldering fires. When such particles enter a chamber in the device, they scatter light from a small light source, which is then picked up by a photoelectric sensor.