Chinese scientists began their research on bird flu vaccine in 2005 中国的科学家们从2005年开始进行禽流感疫苗的研究。
Chinese scientists began their research on bird flu vaccine in 2005 中国科学家于2005年就已开始着手禽流感疫苗的研究。
Chinese scientists began their research on bird flu vaccine in 2005 中国科学家从2005年以来一直致力于禽流感疫苗的研究。
Chinese scientists began their research on bird flu vaccine in 2005 中国科学家于2005年开始了他们在禽流感方面的的研究。
Chinese scientists began their research on bird flu vaccine in 2005 中国的科学家们与2005年开始从事禽流感疫苗的研制工作。
Chinese scientists began their research on bird flu vaccine in 2005 中国科学家在2005年己经开始了他们对禽流感疫苗的研究。
Chinese scientists began their research on bird flu vaccine in 2005 中国科学家早在2005年就已经开始了关于禽流感疫苗的研究。
Researchers in the country say they have developed a bird flu vaccine for human use , and the vaccine is " safe " and " effective " 中国科学家称他们已经研制出人禽流感疫苗，而且安全有效。
Researchers in the country say they have developed a bird flu vaccine for human use , and the vaccine is " safe " and " effective " 国家研究员说，他们已经研制出人用的安全有效的抗禽流感病毒。
Researchers in the country say they have developed a bird flu vaccine for human use , and the vaccine is " safe " and " effective " 其研究员陈已经研制出人用禽流感疫苗，并宣布疫苗是安全有效的。
