1. These light-emitting diodes could simulate red light. 这些发光二极管可以模拟红光。
2. To test their hypothesis, researchers took some electrical lights, actually, they were light-emitting diodes. 为了验证他们的假设，研究人员使用了一些电灯，实际是使用了发光二极管。
3. The Trilobite scuttles around homes emitting ultrasound signals to create maps of rooms, which are remembered for future cleaning. 三叶虫在房屋周围飞来飞去，发出超声波信号，绘制出房间的地图，以备日后清洁时使用。
4. Emitting too much greenhouse gases such as carbon dioxide lies at the root of global warming. 排放过多温室气体，如二氧化碳，是全球变暖的根本原因。
5. The aircraft cost 25 million pounds and can carry heavier loads than huge jet planes while also producing less noise and emitting less pollution. 这架飞机造价2500万英镑，可以比大型喷气式飞机承载更重的载荷，同时产生更少的噪音，排放更少的污染。
