1:鐵路業(yè)主們不愿意冒險,于是他們雇傭了很多獵人向軌道沿線的美洲野牛（bison)瘋狂射擊.（take a chance)
The railway owners never try to take a chance so that the employ hunters to shoot the American bisons along the railway.
2:美洲野牛就在它們倒下的地方慢慢腐爛.（rot)
The bisons rotted where they fell down.
3：在被追逐和獵殺近90年后,美洲野牛最終得以安寧.（leave alone)
Left alone being chased and hunted for nearly 90 years,the American bisons finally get the peaceful life.
By the way,poor的名詞形式是什么?（這句不是翻譯）
poor的名詞形式是poverty