slippery slope
基础篇：a bad situation or habit which, after it has started, is likely to get very much worse.
Once you start to lie, you are on a slippery slope.
进阶篇： slippery slope 是个习惯表达，它的字面意识是“光滑的斜坡”，常用来表示“滑向深渊的道路”，如果不及时采取措施，这种情况会变得更糟糕。它是个非常形象、适合用在口语和写作中的精彩表达，当我们想表达“ something becomes worse” 时就可以用slippery slop 替换。
The first fib can put you on a slippery slope to bigger lies. [fib: small, unimportant lie]
拆东墙补西墙，时间久了就会越来越糟糕，债台高筑。
We've been on a slippery slope of borrowing more money to pay off the debts we already owe.
Over-borrowing will inevitably lead the borrower down a slippery slope.
Any evidence from places that have allowed assisted dying suggests that there is no slippery slope towards widespread euthanasia. 允许协助安乐死并没有导致更多的人选择安乐死。
复习之前的downhill
应用篇：
1） 翻译： 他的傲慢与固执将注定他走向失败。
His arrogance and obstinacy will inevitably lead him down a slippery slope to failure.
2) 造句
场景：想要减肥，但忍不住吃甜食
Keeping eating cookies and ice cream will inevitably lead her down a slippery slope to failure to lose weight.
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