你是不是觉得大海捞针是最难以完成的任务？但是日常生活中比这更困难的事可是不计其数，譬如叫你从一集装箱的牛肉罐头中找出几罐被疯牛病病牛肉污染的罐头；譬如叫你从数百万微生物中间，要在几个小时内准确鉴别出一个或者几个能导致急性传染病的致病微生物；譬如需要你在几? Do you think that the needle in the haystack is the most difficult task to accomplish? But the more difficult things in daily life than this are countless things, such as asking you to find a few jars of canned beef contaminated with mad cow disease from a container of canned beef; for example, telling you how many millions of microorganisms are in between. Accurately identify one or more pathogenic microorganisms that can cause acute infectious diseases within one hour; what if you need them?