我们也能保护退化了的非洲土壤，那里几乎55%的土地不适合任何耕种的农业。
We can also work on safeguarding the degraded soils of Africa, where almost 55% of the land is unsuitable for any kind of cultivated agriculture.
另外，因为幼苗的小根不能轻易扎入含氧少的黏土中，所以只是由黏土构成的土壤不适合种植作物。
Moreover, because young plant rootlets do not readily penetrate poorly oxygenated clay, soil composed exclusively of clay is poor for raising crops.
维京登陆任务显示，由于没有水，强紫外辐射，氧化性的土壤，当前火星表面不适合生命生存。
The Viking lander missions showed the present surface environment of Mars to be unfavourable for life due to the absence of liquid water, intense UV radiation, and oxidizing soils.
维京登陆任务显示，由于没有水，强紫外辐射，氧化性的土壤，当前火星表面不适合生命生存。
The Viking lander missions showed the present surface environment of Mars to be unfavourable for life due to the absence of liquid water, intense UV radiation, and oxidizing soils.
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