If you could move faster than light, your time would move backward.

出自-2011年6月听力原文

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.

出自-2017年6月阅读原文

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.

2017年12月六级真题（第三套）阅读 Section C

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

2017年6月六级真题（第一套）阅读 Section B

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.

2009年考研真题（英语一）完形填空 Section Ⅰ