在环境条件相同的情况下，造成天气复杂多变的主要因素，并不是到处存在的空气，也不是地球本身。
The main cause lies in this, that neither the air nor the earth is everywhere in the same condition.
而水产养殖只有在环境条件，经济条件和鱼的种类适合人工养殖的情况下才能成功。
Aquaculture will only work, environmentally and economically, with the right sort of fish.
如果处于公众讨论加速其进程的撤退环境条件中进行谈判，这种情况就非常有可能。
This is particularly the case if negotiations are accompanied by withdrawals amid a public debate over accelerating the process.
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