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今天我們要學的詞是circulate. Circulate 動詞，意思是傳播。流感疫苗是如何研制的？Flu viruses constantly mutate, and the vaccine is changed every year based on what scientists see circulating. 流感病毒不斷變異，所以科學家每年都要根據眼下正在流行的病毒來研制疫苗。The University of Oklahoma is investigating a video circulating on social media allegedly showing members of a fraternity chanting racist language. 俄克拉荷馬大學對社交媒體上流傳的一段視頻展開調查，據悉視頻上顯示了該大學一個兄弟會成員高喊種族歧視的語言。好的，今天我們學習的詞是 circulate, circulate, circulate...
