下地铁时还有太阳，周围都是阳光灿烂的样子，过了十字路口转过弯儿，一阵“妖风”吹过，天空瞬间转阴，旁边的树吹得哗啦啦作响，远处的乌云也涌上来了，早早的拿出雨伞备着，随时迎接雨水的冲刷，但是都走到住的地了，连个雨毛都没下，这未雨绸缪有点早！
Researchers are racing快速 to make a coronavirus vaccine. will it help?
In the early days of January, as cases of a strange, pneumonia肺炎-like illness were reported in China, researchers at the national institutions of health readied themselves to hunt 全力以赴去做for a vaccine to prevent the new disease.
Scientists in Australia are also working on vaccine candidates to stop the spread of the disease. Historically, vaccines have been one of the greatest public health tools to prevent disease, but even as new technology， advancements in genomics基因学 and improved global coordination have allowed researchers to move at unprecedented speed, vaccine development remains an expensive and risky process.
It takes months and even years before the vaccines must undergo extensive testing in animals and humans. In the best case, it takes at least a year-and most likely longer-for any vaccine to become available to the public.
With each new outbreak, scientists typically have to start from scratch（抓，挠）从头开始. After the SARS outbreak in 2003, it took researchers about 20 months from the release of the viral genome病毒基因组 to get a vaccine ready for human trials. By the time an epidemic caused by the Zika virus occurred occurred in 2015, researchers had brought the timeline down to six months. Now they hope the joint efforts will cut the time in half.
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