它們是按品種分類的.They are classified in sorts.( 運(yùn)輸者也要接受做記錄和分類的要求. )( Transporters are also subject to record - keeping and labeling requirements. )物理界過去和現(xiàn)在都是從不關(guān)心數(shù)學(xué)家們的分類的.The physical world was and still is indifferent to the ma...