另外，世界森林是天气循环和碳-氧循环的一个重要组成部分。
Additionally, the forests of the world are a critical part of the weather cycle as well as the carbon-oxygen cycle.
如果大地只有太阳的普照，那么每年的各个季节中，天气就不会有什么差别，夏天一样的热，冬天一样的冷，天气就会这么一年一年的一成不变地循环。
If the sun's influence alone were prevalent, there would be no change at all during our seasons; once cold or warm, it would invariably continue to be so, according to the time of the year.
另外，由于天气炎热与沙尘，中东的更新循环短暂，因此也意味大量的后续工程。
The Middle East also has short replacement cycles, thanks to heat and sand, which means bigger follow-on contracts.
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