noun 下载 🔗分享 遮蔽，蒙蔽，模糊。 The state of being obscured. Examples : "The sudden obscuration of the sun by dark clouds made the afternoon feel like evening. " 突然间，乌云遮蔽了太阳，使得下午感觉像是傍晚一样。 appearance condition nature 与AI对话词汇游戏阅读练习
noun 下载 🔗分享 遮蔽率，阻光率 A unit of measurement used in particular for smoke detectors which respond to absorption of light by smoke, in percent absorption per unit length, e.g. % obs/ft, % obs/m. Examples : "The fire alarm triggered when the smoke reached 4% obscuration per foot, indicating a significant amount of smoke blocking the light beam within the detector. " 当烟雾浓度达到每英尺4%遮蔽率时，火警警报器被触发，表明大量的烟雾阻挡了探测器内的光束。 technical physics unit science device 与AI对话词汇游戏阅读练习
