translation.en: This was not the first synthetic virus -- a polio virus had been made a year before -- but it was only one ten-thousandth as active and it took three years to do.
translation.zh: 这并非第一个合成的病毒 一年前已有某种脊髓灰质炎病毒被制造了出来 但这却是唯一达到百分之一活性的病毒 耗时三年才合成成功