这个技能小时候教了不到一分钟就会了

{!-- PGC_VIDEO:{"thumb_height": 1440, "vposter": "http://p0.pstatp.com/origin/tos-cn-p-0000/559fd3546998448fbef581697e49e83e", "thumb_width": 808, "vid": "v02016a40000bpqr25r3ft9k8h48v1jg", "vu": "v02016a40000bpqr25r3ft9k8h48v1jg", "duration": 25.28, "thumb_url": "tos-cn-p-0000/559fd3546998448fbef581697e49e83e", "thumb_uri": "tos-cn-p-0000/559fd3546998448fbef581697e49e83e", "video_size": {"high": {"duration": 25.28, "h": 1440, "w": 808}, "ultra": {"duration": 25.28, "h": 1440, "w": 808}, "normal": {"duration": 25.28, "h": 1440, "w": 808}}} --}