最后他改变速度，来一个长时间的垂直慢滚。
At last he turned that speed straight up into a long vertical slow-roll.
他一转身又作另一次尝试，这次是十六点垂直慢滚，一边翻滚一边大声数着点。
He pulled abruptly into another try at a sixteen point vertical slow roll, calling the points out loud.
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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