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。
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.
无论你身处空窗期或者两人世界，这个简单的练习都能让你感到满足，随时随地，在情人节，或者情人节以外的任何一天。
Whether you are enjoying single-hood or couple-hood, this simple practice can be practiced to your heart's content anytime, anywhere, any day, and not just on Valentines' Day.
这一期我们将一起练习一些早餐时常用的口语表达方式。
In this period, we will learn and practise some useful expressions at breakfast.
应用推荐