1. The gas is fed back over the calcium oxide. 气体的反应体现在氧化钙上。
2. To recover the energy, the gas is fed back over the calcium oxide. 为了回收能量,气体重新与氧化钙反应。
3. Heating this chemical compound drives off carbon dioxide gas, leaving calcium oxide. 这种化合物加热后会排出二氧化碳,产生氧化钙。
4. Nitrogen-oxide emissions during the cruising portions of the flight fell by around a quarter. 飞行中巡航部分的氮氧化物的排放量下降了四分之一左右。
5. Insects produce less ammonia than pig and poultry farming, ten times less methane than livestock, and 300 times less nitrous oxide. 昆虫产生的氨比猪和家禽少,它们产生的甲烷比家畜少十倍,而产生的一氧化二氮比家畜少三百倍。