Concerning class, electronic divide exists among the distinct types of staff and among the higher and middle lessons along with the reduced class. passageway通道;cavity洞，凹处;cylinder汽缸;orifice孔口;corridor门厅，走�?cylindrical圆柱形 这意味着，如果众议院愿意考虑一项替代这项法案的议案，最早也