In earlier navigations, there were many cases of failure due to deficiency of vitamin and subsequent occurrence of scurvy.

 
  • 但早期的遠航,因飲食單調,缺乏維生素,發(fā)生“壞血病”而屢遭失敗的事例頗多,然而鄭和船隊沒(méi)有因缺乏維生素而發(fā)生壞血病這類(lèi)疫情。
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