1·Recently planetary scientists have suggested that the external preconditions for the development of Earth's biosphere probably included four paramount contingencies.
最近，行星科学家提出，地球生物圈发展的外部先决条件可能包括四个最重要的偶发事件。
2·This ecosystem is one of the fascinating paradoxes of the biosphere: how do clear, and thus nutrient-poor, waters support such prolific and productive communities?
这个生态系统是生物圈中令人着迷的悖论之一：清澈而又缺乏营养的水域是如何支撑如此多产的群落的？
3·Biocycle is the cycling of chemicals through the biosphere.
生物循环是化学物质在生物圈内的循环。
4·In the immense and vast global biosphere, there exists a kind of noteless melanocratic organic matter which is humic substances.
在浩瀚广袤的地球生物圈里，蕴藏着一种不引人注目的暗色有机物，这就是腐植酸类物质。
5·And if the biosphere is in trouble, then man is in trouble, for human beings are not immune to extinction, though they may like to think so.
如果生物圈有麻烦，人类就会有麻烦，因为人类不能够自外于物种灭绝，虽然他们喜欢这样认为。