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既要稳定种植老品种，也要循序渐进推动品种更新。
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Mentors are the fast-track to success. Entrepreneurs seek out mentors within their industry to help them figure out what works and what does not work. This saves them time and, more importantly, money, which is often a scarce commodity, especially during the early stages of their entrepreneurial journey. Mentors also infect entrepreneurs with their good habits.
王书肖说，目前，全国有约两成城市PM2.5年均浓度处在25—30微克/立方米之间，这些城市“跳一跳能够得着”；约17%的城市PM2.5年均浓度处在30—35微克/立方米范围内，需要努力先满足过渡期要求；仍有超过10%的城市PM2.5年均浓度大于40微克/立方米，达到新标准非常有难度。