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古人说，四十不惑。很多人不惑之年就做了教授，而放眼所见，却颇觉困惑。因为选择做学术，原觉得是一项神圣的事业，可以作独立思想的探索、自由精神的发挥，亦以安顿心灵。圣人说，古之学者为己，今之学者为人。成了教授，本当可以做“为己”之学了，不料却依然天天做着“为人”之学以应付考核，这便是“惑”之由来。
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MacBook Pro was built with the environment in mind, and brings Apple even closer to reaching its ambitious plan to be carbon neutral across its entire footprint by 2030. It is made with 45 percent recycled content,8 including 100 percent recycled aluminum in the enclosure and 100 percent recycled cobalt in the battery. It is manufactured with 50 percent renewable electricity, such as wind and solar, across the supply chain. The new MacBook Pro is designed to be durable and repairable, and also offers industry-leading software support, while meeting Apple’s high standards for energy efficiency and safer chemistry. The paper packaging is 100 percent fiber-based and can be easily recycled.9