当小天才手表像书包、铅笔一样，成为校园的“标配”，我们或许应该思考：这块本为“安全”而生的小屏幕，为何悄然变成了孩子们的“社交竞技场”？
For decades, the Valero refinery shaped Benicia’s economy, politics and health. Now the city has become a reluctant test case of whether an oil town can reinvent itself，更多细节参见51吃瓜
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What are Moon phases?According to NASA, the Moon takes about 29.5 days to orbit the Earth. Over the course of this period, it moves through eight recognisable phases. While the same side of the Moon always faces us, the amount of its surface lit by the Sun changes as it continues along its path. The shifts in sunlight create the different appearances we see from Earth, ranging from a fully illuminated Moon to a thin sliver or near darkness. The eight phases are:
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But, according to the Met Office, if global temperatures rise by more than 2C (above pre-industrial levels) this would increase to nine days.