六级The reasoning behind this saying is that low oil prices discourage investment in new production capacity, eventually shifting the oil supply curve backward and bringing prices back up as existing oil fields—which can be tapped at relatively low marginal cost—are depleted.
这一说法背后的理由是，低油价阻碍了对新产能的投资，最终使石油供应曲线向后移动，并随着可以以相对较低的边际成本开采的现有油田枯竭而使价格回升。
2017年6月阅读原文
六级It is the season for some frantic last-minute math一across the country, employees of all stripes are counting backward in an attempt to figure out just how much paid time-off they have left in their reserves.
这是一个疯狂的最后一分钟数学的季节一在全国各地，各行各业的员工都在倒数，试图计算出他们的储备中还剩下多少带薪休假时间。
2017年12月六级真题（第三套）阅读 Section C
六级The reasoning behind this saying is that low oil prices discourage investment in new production capacity, eventually shifting the oil supply curve backward and bringing prices back up as existing oil fields—which can be tapped at relatively low marginal c
这句话背后的理由是，低油价阻碍了对新产能的投资，最终将石油供应曲线向后移动，并使价格回升，成为可以以相对较低的边际成本开采的现有油田
2017年6月六级真题（第一套）阅读 Section B
四级If you could move faster than light, your time would move backward.
如果你能比光速快，你的时间就会倒流。
2011年6月听力原文
考研Instead of casting a wistful glance backward at all the species we've left in the dust I.Q.-wise, it implicitly asks what the real costs of our own intelligence might be.
它不是满怀渴望地回头看一眼我们在智商方面留下的所有物种，而是含蓄地问我们自身智力的真正代价是什么。
2009年考研真题（英语一）完形填空 Section Ⅰ
四级In fact, all the classes did not prepare me for my battles with the machine I ran in the plant, which would jam whenever I absent-mindedly put in a part backward or upside down.
事实上，所有的课程都没有让我为与工厂里运行的机器的战斗做好准备，每当我心不在焉地把零件倒过来或倒过来时，机器就会卡住。
2012年12月大学英语四级真题试卷（1）
四级After spending years fretting（烦恼）over which toys to buy, which apps to download and which skill-building programs to send their kids to after school, letting them simply play—or better yet, playing with them—could seem like a step backward.
在经历了多年的烦恼之后(烦恼）在购买哪些玩具、下载哪些应用程序以及放学后送孩子去学习哪些技能培养程序的问题上，让他们简单地玩——或者更好的是，和他们一起玩——似乎是倒退了一步。
2020年9月大学英语四级真题（第1套）
考研Nevertheless, some children are still backward in speaking.
尽管如此，一些孩子的口语仍然落后。
1993年全国硕士研究生入学统一考试英语试题
未经许可，严禁转发。QQ交流群：688169419