We use the simple past tense to talk about what happened at a definite time in the past.
我们用一般过去时来谈论过去的某一事件发生的事情。
Since the 1920s, scientists have known the universe is expanding, which means it must have started at a definite time in the past.
自20世纪20年代以来，科学家已经了解到宇宙正在澎张。这就是说宇宙一定是在过去的某一特定时候开始形成的。
He chooses at a definite time and place under definite conditions between a strictly limited quantity of gold and a strictly limited quantity of iron.
他是在一定时间、一定地点，在确定数量的金和确定数量的铁之间作选择。
At that time we'll start on a definite therapy for you condition.
那时我们要开始对你的病进行确切的治疗。
My next inference is that he was going to a definite destination and that he had to be there at a particular time.
我的下一个推论是说话者将前往一个确定的地点并且必须在某特定时间抵达。
This means that all program elements have a definite type at compile time, guaranteeing type safety, but that you do not have to specify the types of every value explicitly.
这意味着，所有程序元素的类型在编译时都要明确，从而确保类型安全，但您不需要显式指定每个值的类型。
At that time I thought it likely that a definite clue to the actual facts might be brought out.
当时，我认为很可能可以找出确切的线索，探明事实的真相。
At the same time, a new proof is given for the sufficient and necessary condition of the SOR method applied to symmetric and positive definite system.
进一步丰富了SOR理论，同时给出了SOR方法在对称正定条件下收敛的充要条件的又一新证明。
It goes without saying is that the landscape of content and creative at this time have a definite impact was expected.
不言自明的是，山水画的创作内容及形式在此时产生了一定的影响是意料之中的。
It goes without saying is that the landscape of content and creative at this time have a definite impact was expected.
不言自明的是，山水画的创作内容及形式在此时产生了一定的影响是意料之中的。
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