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VOA慢速英语:羊能识别人的面孔
2017-11-24来源:和谐英语
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infrared – adj. producing or using rays of light that cannot be seen and that are longer than rays that produce red light
beam – n. a line of light coming from a source (such as the sun or a headlight)
screen – n. the surface on which the image appears on an electronic device
angle – n. the difference between the direction of two lines that come together
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