But low levels of current productivity is precisely why many wish to get in here — to achieve the superior returns that accompany increases in marginal revenue.
Continued global warming could turn currentmarginal grasslands into deserts as rainfall patterns change.
持续进行的全球暖化可能让目前仅存的一点点草原变成沙漠，就像雨林消失的模式一样。
3
The currentmarginal sea and trench-arc-basin system of west Pacific is reformed by interaction of Pacific plate, Australian plate, and Eurasia plate in Cenozoic.