他们跟着他滚，脸上露出笑容。

They rolled with him, smiling.

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最后他改变速度，来一个长时间的垂直慢滚。他们跟着他滚，脸上露出笑容。

At last he turned that speed straight up into a long vertical slow-roll. They rolled with him, smiling.

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人们脸上的笑容能透露出他们的感受。

The smiles on people's faces can reveal their feelings.

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确认这东西不过是个大号的相机后，他们的脸上露出了笑容。

Upon confirming that this was just a large-sized camera, smiles appeared on their faces.

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确认这东西不过是个大号的相机后，他们的脸上露出了笑容。

Upon confirming that this was just a large-sized camera, smiles appeared on their faces.

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