For a long time biologists believed that male deer used buck rubs not only to clean and polish antlers but also to provide practice for the ensuing male-to-male combat during the rut.
长期以来，生物学家们认为雄鹿擦痕不仅可以清除并磨光鹿茸，还可以借此练习发情期时雄鹿之间的角斗。
Action nis the wheel of upward, only action, rut will upward. Whatever grade now, as long as there is action, anything is possible.
行动是向上的车轮，只有行动，车辙才会向上。无论现在成绩如何，只要有行动，一切皆有可能。
In one day you can change your skiing; and build it toward efficiency, rather than staying stuck in the rut that only deepens the frustration generated by the inefficient movement spiral.
在一天之内可以更改您的滑雪，建设这对效率，而不是在发情期，只有加深了效率螺旋运动产生的沮丧坚持住。
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