圖像來源，Getty Images
Crawford - whose parent company is based in the US - was approached for comment, but the firm referred the BBC to the NHS.
，详情可参考旺商聊官方下载
其中白色是广角像素、蓝色是窄角像素，转动屏幕，窄角像素就看不见了。
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6. Facebook Audience Insights (Audience Research)(Photo Credit:- Facebook Audience Insights