seasonal worker 季節労働者

9:52 originally sake was made by seasonal laborers. お酒はもともと農家が農閑期の冬季に醸造下のが始まり。

[Begin Japanology] Season 5 EP11 : Japanophiles Philip Harper 2012-03-29
https://www.youtube.com/watch?v=ST8ufz-3qKs  1:51 seasonal workers
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https://www.youtube.com/watch?v=S56Ul25RyUc  1:15 seasonal workers
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https://www.youtube.com/watch?v=7W8jeULmucg  1:09 seasonal employees
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参考リンク
http://bridge-english.blogspot.jp/2014/06/seasoned.html  seasoned について
https://www.youtube.com/watch?v=YflWZanT82w  0:58 migrant workers 出稼ぎ労働者
China's manufacturing sector facing giant downturn - PressTV 111213