单词：HCO
abbr. 重循环油（heavy cycle oil）
词型变化：名词复数形式 : hcoes
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By Catherine Maddux Washington 29 May 2006 Malnourished boy sits at a Medecins sans Frontieres' hospital in El Wak village in drought stricken north eastern Kenya, March 4, 2006 Every year, untold numbers of African doctors and nurses leave the cont
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