That means keeping the land, water and air clean.
这意味着要保持土地、水和空气的清洁。
They keep our air clean, reduce noise pollution, improve water quality and provide food and building materials.
他们保持我们的空气清洁，减少噪音污染，改善水质，提供食品和建筑材料。
Trees reduce dust and help keep the air clean.
树木减少灰尘，有助于保持空气清洁。
Trees help keep the air clean and they make oxygen that we can breathe.
树木有助于净化空气，释放出可供我们呼吸的氧气。
它们帮助保持空气干净。
我们应使我们的大气干净。
树木使我们的空气干净。
Trees and flowers can keep the air clean.
树和花能使空气保持干净。
It is important to plant trees to keep air clean.
种树保持空气干净是很重要的。
We should keep the air clean and fresh and keep our bodies clean.
我们应该保持空气清洁和新鲜，保持身体干净。
But kind people want to protect the environment and make the air clean.
但是善良人们想要保卫环境和使空气变得干净。
But kind people want to protect the environment and make the air clean.
但是善良人们想要保卫环境并且使空气干净。
We should keep the air clean and fresh that will be good for our health.
我们应该持续空气清洁和新鲜的对我们的健康有好处。
They are encouraged to use bicycles, which are thought to help keep the air clean.
鼓励人们使用有助空气清洁的自行车。
What's more, when we are at home, we should open the Windows to keep the air clean.
更重要的是，我们在家的时候，我们应该打开窗户以保持空气清洁。
Trees are very useful to human beings. They can give ue shade and make the air clean and fresh.
树对人类很有用，它们给我们提供树荫，而且还使空气清新。
People in Seattle will say they like the rain keeping the city green, and making the air clean afterwards.
西雅图人会说他们喜欢雨使这个城市变绿，使空气变得清新。
With fuel mixture in the air inhaled air filter, air filter dust, carbon and other debris, which guarantees the inhaled air clean.
在吸入空气与燃油混合之前，空气滤清器滤去空气中灰尘、碳及其它杂物，从而保证了吸入空气的清洁。
May be used in machines compressing air for breathing purposes (such as air bottles for divers) provided all compressor units include subsidiary air clean-up apparatus.
亦适用于呼吸装置专用的空气压缩机，例如用于潜水的氧气樽，但必须配备副助空气清洗装置。
No American should have to drive out of town to breathe clean air.
任何美国人都不应非得开车出城去呼吸清洁的空气。
Its clean air, attractive parks, and the absence of any industry, make this an ideal spot for people looking for a quiet life.
它有干净的空气、吸引人的公园以及没有任何工业，使它成为人们寻找安静生活的理想场所。
Seven months and one election day later, a new conservative city council suspended enforcement of the clean air zone, a first step toward its possible demise.
七个月后大选日结束的第一天，由保守派掌控的新一届市议会中止了“清洁空气区”的执行，迈出了废除该项措施的第一步。
Citizens of wealthy nations demand national parks, clean rivers, clean air and poison-free food.
富裕国家的公民要求有国家公园、干净的河流、干净的空气和无毒的食物。
In smoggy weather, the machine would breathe in the air in front of the bike and blow out a stream of clean air toward the biker's face.
在有雾霾的天气里，机器会吸进自行车前面的空气，然后向骑自行车的人的脸上吹出一股清新的空气。
We also need to clean up spills as soon as they occur, and store food in air-tight containers.
我们还需要尽快清理溢出的液体，并将食物储存在密封的容器中。
Plants keep our air and water clean.
植物能保持空气清新和水源清洁。
Plants keep our air and water clean.
植物能保持空气清新和水源清洁。
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