U. S. and Russian government officials say it is essential they keep some smallpox alive in case a future biological threat demands more tests with the virus.
美国和俄罗斯的官方表示,留存一些天花病毒以进行更多的测试,这对未来应对生物威胁是非常必要的。
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The French were practically cheering on the Indians as India prepared its series of nuclear tests in 1998, and the United States later reached its own deal with New Delhi that bestowed a u.