鉴于城市土壤里的铅会导致人生病，社区和学校是否应该停止在城市荒地上种植物呢？
Should the prevalence of lead in city soils discourage communities and schools from building gardens in urban wastelands?
棉田棉花花粉含量低，其他植物花粉含量高，花粉组合特征与荒地相似，很难与荒地区分开来；
The percentages of malvaceae pollen are quite low and other species are the main pollen types, with poor consistency to the local vegetation cover.
在荒地附近逐渐增建的动植物栖息地会受到火灾的威胁，所以计划火烧有时候被用来预防森林火灾。
Homes increasingly being built near wildlands are so threatened by fire that 'prescribed burns' are sometimes used as prevention.
应用推荐