一个戴着防撞头盔的男子正骑上一辆摩托车。
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.
好吧，看这儿，邻居——你撞头彩了！
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.
但是她绝不退步—不管他怎么欺负兄弟姐妹，吼叫或撞头，他的妈妈都不会让他超出一定的限度。
But she never caved — if he hit a sibling, no matter how much he screamed or banged his head, his mother would not let him out of time-out.
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.
先有快艇在6个小时里行驶190英里，把我们送到泰国边境。航程很危险，游客们必须戴上防撞头盔。
Speedboats cover the 190 miles to the Thai border in six hours, but are such a rough ride that passengers need to wear crash helmets.
爸爸们由于其他原因受伤的可能性也不低——差不多三分之一的父亲曾被孩子撞头，四分之一常常和孩子们小打小闹时扭伤。
There e's no let-up for fathers as just under a third have been head-butted by their young child while a quarter said play-fighting with the kids regularly saw them tweak something.
爸爸们由于其他原因受伤的可能性也不低——差不多三分之一的父亲曾被孩子撞头，四分之一常常和孩子们小打小闹时扭伤。
There e's no let-up for fathers as just under a third have been head-butted by their young child while a quarter said play-fighting with the kids regularly saw them tweak something.
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