例句
英语六级真题
  • Two strains of the disease, with almost identical symptoms, affected humans-Ebola-Zaire and Ebola-Sudan.
    出自-2013年6月听力原文
  • Both strains quickly invaded local hospitals when needle sharing and other unhealthy practices ensured the rapid spreading of the infection by bringing people into contact with contaminated body fluids
    出自-2013年6月听力原文
  • More strains will evolve from the Ebola virus.
    出自-2013年6月听力原文
  • Over the next year and a half investigators will test the various strains of salt-tolerant rice they've bred.
    2018年6月六级真题(第二套)阅读 Section C
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