The start of yeast extract production dates back to early 20th century.

酵母抽提物的生产开始于20世纪早期。

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Tina Bruno, who runs The Coalition for a Traditional School Year, a nonprofit group in San Antonio, Texas, that lobbies against early start dates, said she has fielded scores of calls from parents fighting pre-Labor Day resumption.

WSJ: School in August Gets Low Grades