the first postulate（首先的假定） searching for the medium of light（寻找光传播的介质） the second postulate（第二次假定） ..
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The first postulate of a user-centred theory is that the built environment exists to support the activities of users that it shelters.
以用户为中心的理论的首要前提是，建成环境的存在是为了支持它所容纳的用户的活动。
However, Koch had to abandon part of his first postulate when he discovered that healthy people could carry the germs of certain diseases and yet show no symptoms.
然而科赫后来发现，一些健康的人能毫无症状地携带某种特定致病菌，而且一些人暴露于狂犬病菌却依然没有患上狂犬病。
The postulate they had planned to test was that the first stars to form after the Big Bang would have left some signs of themselves in the form of radio waves.
原本，他们是为了验证大爆炸之后形成的第一批星球以辐射波的形式保留下了一些迹象；
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