2. A century ago, much, if not most, of our effort was
expended in producing food, clothing, and shelter.

一个世纪之前,我们的许多努力、乃至大部分努力,用于生产食品、服装和住房。
3. Air enters the engine from the air intake in the frame and the
expended gases exit via dual mufflers symbolizing the seat rails.

空气进入发动机的进气中的框架和支出气体出口通过双消音器,象征着座位扶手。