研究环境问题专家说，在真正的冷空气到来之前，现在正是英国养猪者检查他们的通风系统正常工作的时候。
UK - Now is the time for pig producers to check that their ventilation systems are working properly, before the really cold weather sets in, says a professional environmentalist.
研究环境问题专家说，在真正的冷空气到来之前，现在正是英国养猪者检查他们的通风系统正常工作的时候。
UK - Now is the time for pig producers to check that their ventilation systems are working properly, before the really cold weather sets in, says a professional environmentalist.
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