Many cities with bans still allow shoppers to purchase paper bags, which are easily recycled but require more energy to produce and transport.
许多有禁令的城市仍然允许消费者购买纸袋。虽然纸袋很容易回收，但生产和运输需要更多的能源。
The bugs, which are less than a millimetre long, feed on scales of human skin and produce allergens which are easily inhaled during sleep.
这些体长不超过一毫米的虫子以人类皮肤的鳞屑为食，并且产生的过敏原在睡眠时很容易被吸入。
The South had much less industry and fewer railroads. It could not produce as much military equipment, and it could not transport supplies as easily as the North could.
南方没有更多的工业，铁路线也很少，南方不能像北方那样生产那么多的军事装备，而且南方的铁路运输也没有北方那么方便。
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