Different categories of sources and pollutants recognized by the Act are discussed in separate subsections.由《洁净空气法案》区分的不同种类的污染源与污染物将在下面讨论.Subsections appear in your object file in numeric order, lowest numbered to highes...

n.分部( subsection的名词复数 )，分段，小部分，小单位...

subsections的音标：...