.Unit 11. 每架飞机起飞前必须经过严格的检查。(check out)Each and every plane must be checked out thoroughly before taking off.2. 居民坚决反对在附近建立垃圾焚烧厂，因为他们担心工厂排放的气体会污染周围的空气。(waste incineration plant, concerned about)The residents were firmly opposed to the construction of a waste incineration plant in their neighborhood because they were deeply concerned about the plants emissions polluting the air.3. 在这个地区，生态工程的投资额高达数十亿元。(mount to)In this area, investment in ecological projects mounted up to billio
