其次，再补给任务的运输空间就只有这么大。
And second, there's only so much room aboard the resupply missions.
他们节省运输空间，便于储藏和货物分发。
They save shipping space and facilitate the storage and distribution of the goods.
其原因可能是仔猪趴卧的面积并不是仔猪运输空间的最低阈值，这需要进一步研究证实。
It is possible that pigs' sternum area is not the lowest limit of transport space allowance.
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