natural gas天然气naturaladj.自然的；天然的；私生的Natural populations天然群体natural water cycle自然界水循环natural form change景观变迁natural superiority自然优势Natural Wood Colour自然木色Natural agriculture自然农业natural killercells自然杀伤细胞natural sand cobble天然级配砂卵石土natural consistency天然稠度natural capacitance固定电容

1. The ally of the working class was the peasantry.
   工人阶级的同盟军是农民阶级。
2. But in the final analysis the middle elements are good people, an ally of the proletariat.
   但是，中间派归根结底是好人，他们是无产阶级的同盟军。