讲解：
district
区；管区；行政区:
a tax / postal district
税务/邮政区
a school district
学区

howl (in / with sth)
(因疼痛、愤怒、开心等)大声叫喊:
We howled with laughter.
我们放声大笑。

on all fours
匍匐着；趴着:
We were crawling around on all fours.
我们匍匐着四处爬行。

yell (out) (sth) | ~ (sth) (at sb / sth)
叫喊；大喊；吼叫:
He yelled at the other driver.
他冲着另一位司机大叫。

savage to death
凶狠地攻击(或伤害)；残害:
She was savaged to death by a bear.
她遭熊袭击而丧命。