Puppies love to tumble and roll and play.

小狗爱倒下和轧辊和发挥。

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That is understandable as grim economic data continue to roll in from around the world and stock markets tumble.

随着世界各地不断有惨淡的经济数据出炉，股市纷纷下挫，这种现象是可以理解的。

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As I was in the air, I kept thinking, When you hit the ground, roll and tumble and it won't hurt so much.

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Meanwhile, rock and roll was taking a huge tumble in the Billboard charts.

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