Their observations laid the ground work for our present understanding of the universe.
他们的观测给我们现代对宇宙的了解打下了基础。
At the present rate of progress some centuries will be needed for the great work.
目前的进展速度有些世纪将需要伟大的工作。
At the present rate of progress some centuries will be needed for the great work.
目前的进展速度有些世纪将需要伟大的工作。
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