读书摘要✂：
「Raspberry_Pi： Raspberry Pi 4 is here! A tiny, dual-display desktop computer, with three RAM variants to choose from, and all the hackability you know and love. On sale now from the familiar price of $35: http://bit.ly/2Rt0f6Y #RaspberryPi4 http://bit.ly/2xcxDFO 」
「Raspberry_Pi： Raspberry Pi 4 is here! A tiny, dual-display desktop computer, with three RAM variants to choose from, and all the hackability you know and love. On sale now from the familiar price of $35: http://bit.ly/2Rt0f6Y #RaspberryPi4 http://bit.ly/2xcxDFO 」