题目内容
From the time when Einstein came up with the idea of gravitational wave, man dived into its existence.
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When winter comes, we stop running from the bombs so we canhide from the severe elements.
we find an spartment in the slums that provides a minimal coverage from the snow.
The teacher summoned all the children to the room.
My mother stand brooding at the window for hours; I can see her fixed stare.
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