These characters can hardly hold true in edge-emitting lasers because of the limitations of their structure.
而传统边发射激光器不属于微腔结构，对外光反馈的抑制能力较弱。
The new lens, which is thinner at the bottom than at the top, steers light to a viewer's eyes by switching light-emitting diodes along its bottom edge on and off.
这个新镜头，底部比顶部更薄，通过切换镜头底部边缘的发光二极管的开和关，控制进入到观众的眼睛的光线。
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