Obstacles
n. 障碍（物）( obstacle的复数形式 ); 障碍物; 绊脚石; 障碍栅栏
🗣️ 情景例句
We'd wait until dark and make a fire,
我们等到天黑就升火，
Kill two birds with one stone.
一石双鸟；一箭双雕。
It has expanded without any idea of the true nature of the human beings who run the machines,
现代工业发展起来了，却根本没想到操作机器的人的本质。