The video appears to show a woman playing a matching card game that teaches you “the basics of the potash stuff” according to the cameraman. As the woman (who I assume is the cameraman’s supportive mother) flips two matching cards, she reads off the countries who produce the most potash.
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，这一点在wps中也有详细论述
Who doesn't love an aerial?Image by Mat Smith for Engadget
Despite its small, compact size (it weighs just 249.9 grams), this drone has some seriously powerful qualities, including a 1-inch CMOS sensor that records 4K video at up to 60fps with HDR for vibrant colours and strong detail. The flexible gimbal supports true vertical filming and up to 225° rotation, helping you get creative, cinematic shots.
Джо Байден. Фото: Jim Vondruska / Reutersв