菲涅尔镜片又称螺纹透镜，镜面上刻录了大小不一的螺纹。上一代主流会采用菲涅尔镜片因为这样透镜更薄更轻，厚度很薄，通常只有几毫米，重量也大大减轻。使用螺纹镜片会有一定的牺牲，因为螺纹会影响曲率和光线聚焦。 How can this reward you? This update modernizes the platform and helps you mature your audience more rapidly, which means more subscribers and more quickly usage of Product Achievement A... https://coingenius.news/top-analyst-says-xrp-bull-rally-has-barely-started-why-he-envisions-2017-style-price-boom-coming/