On certain sites, particularly in South America, savanna formation seems related to frequent cutting and burning of moist forests for pastureland.
在某些地方，特别是在南美洲，稀树草原的形成似乎与频繁地砍伐和焚烧潮湿的森林作为牧场有关。
Most notably, they found that very high doses of antioxidant polyphenols shut down and prevent cancerous tumors by cutting off the formation of new blood vessels needed for tumor growth.
他们发现高剂量的抗氧化多酚物质由于通过切断肿瘤生长所需要的新血管形成来减少和预防肿瘤发生而具有明显的治疗作用。
Cutting gas is to ensure that the formation of plasma jet, and to ensure that remove the molten metal oxides and incision.
切割气体既要保证等离子射流的形成，又要保证去除切口中的熔融金属和氧化物。
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