headfirst note策略模式
headfirst entry头先入水的跳水动作
headfirst slide头前滑垒
fall headfirst倒栽葱
Headfirst position头前位
HEADFIRST PRODUCTS国别
enter water headfirst头朝下跳入水中
Headfirst for Halos唱片名
headfirst forward roll鱼跃前滚翻
ADV（副词） If you move headfirst in a particular direction, your head is the part of your body that is furthest forward as you are moving. 头向前地 [ADV after v]
He had apparently fallen headfirst down the stairwell.
他看上去是从楼梯井口头朝下摔下来的。