1.disparity (尤指因不公正对待引起的)不等，悬殊

Their absence helps explain the massive disparity in costs between Western and emerging-world treatments.

这就解释了为什么西方和新兴市场国家医疗支出差距如此之大q[r6[!|4DG+;B1jkgP。

2.wealth gap 贫富差距

"The growing wealth gap is threatening the middle class," says a local economist.

“日益拉大的财富差距正在威胁着中产阶级，”一位当地的经济学家这样说meH_N~v;j#E。

3.copious 大量的

She supports her theory with copious evidence.

她以大量的论据来支持自己的理论0vufmcbpQS。

4.hitch a ride 搭便车

It's dangerous to hitch a ride in the United States.

在美国搭便车是非常危险的Naj*uzCEWR2P。