雄性鹿角蝇也做同样的事情，只不过它们用鹿角互相头撞头——以赶走竞争对手。
Male antler flies do the same, except they use their antlers to head-butt each other—to see off rivals.
马来熊的求爱过程是十分壮观的，牠们会显示出拥抱、打斗游戏、甚至互相撞头的行为。
The courtship of a sun bear is quite spectacular they will show such behaviour as hugging, play fighting and even head bopping with each other.
意大利式亲吻的次数是随意选择的，没有明确规定需要先亲吻哪一侧的脸颊，但是会经常撞头。
The number of kisses is optional, and as there are no rules on which cheek to kiss first, there are often clashes.
意大利式亲吻的次数是随意选择的，没有明确规定需要先亲吻哪一侧的脸颊，但是会经常撞头。
The number of kisses is optional, and as there are no rules on which cheek to kiss first, there are often clashes.
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