After graduating from Yale, Whitney went south to teach school, and while visiting on a Georgia plantation he invented the cotton gin, a machine which put an end to the old method of separating seeds from the cotton by hand.是什么意思_After graduating from Yale, Whitney went south to teach school, and while visiting on a Georgia plantation he invented the cotton gin, a machine which put an end to the old method of separating seeds from the cotton by hand.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句