You should see the flash-card screen roll down from the top right corner, stay for a bit, then roll back up.
应该可以看到flash-card屏幕从右上角滚下，停留一会儿，然后又向上滚回。
The central idea is based on the Greek methodical character Sisyphus who was forced to roll a large stone up a steep hill, which tumbles back down when it reaches the top.
科林斯王被迫将一块巨石滚上一座陡峭的山，每当石头到达山顶时又滚到了山底。
The central idea is based on the Greek methodical character Sisyphus who was forced to roll a large stone up a steep hill, which tumbles back down when it reaches the top.
科林斯王被迫将一块巨石滚上一座陡峭的山，每当石头到达山顶时又滚到了山底。
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