Known as the centromere, the middle space between the two arms of the Y chromosome is key to its health.
熟知着丝点的都知道，两条Y染色体中间的空间对于染色体的健康至关重要。Yet military hardware, so essential for security 50 years ago, is no longer the only form of security threat that matters.
然而，50年前对安全至关重要的军事装备已不再是唯一一种重要的安全威胁。He said that SARS is a common threat faced by the humankind. China's work is of uttermost importance in prevent the spreading of SARS.
他说，非典是人类面临的共同挑战，中国的工作对防止其蔓延至关重要，欧盟愿向中国提供必要的援助。But he said that farm output would be substantially stronger after bountiful monsoon rains, which are crucial for agriculture.
但他表示，由于今年雨季降水充足（这对农业至关重要），农业产出将大幅提高。But the early years of a career are also essential and could influence pay down the road.
不过，早年的就业经历同样至关重要，且可能影响到今后的工资水平。And although the Fed is still going to have more tools available to it, it is critical that the other branches of government step up.
而虽然美联储仍会有更多可以动用的工具，但政府其它部门也拿出相应措施是至关重要的。Robert Kennedy, JFK's attorney general, was an important part of the back-channel negotiations that got us off the hook.
约翰·肯尼迪的总律师罗伯特·肯尼迪在其后台渠道的协调中起到了至关重要的作用，使我们摆脱了险境。He said it was vital that information published should be accurate, rather than prompt but imprecise.
他说至关重要的是信息发布的准确性，而不是只求速度而不准确。How much copper will the world's largest copper importer export? That counterintuitive question is critical to the outlook for the metal.
全球最大的铜进口国，将出口多少铜？这个有点奇怪的问题对铜市的前景至关重要。