单词:endurance contests
[网络] 耐力比赛
(endurance contest 的复数)
(endurance contest 的复数)
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This is Scientific American's 60-Second Science. I'm Christopher Intagliata. Got a minute? Tricky cyclists in the Tour de France sometimes cheat by upping their red blood cell count for those tough stretches through the Alps. But researchers at Calif
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加州语文教材California Treasures G5