not long before的用法和樣例：
例句
- For a while that book was indeed very popular, but it was not long before the demand petered out.
那本書的確風行一時，可是不久就變得沒有什么銷路了。 - After all those hours of arguing, the talks began to head out and it was not long before we were able to reach an agreement.
我們經過好多小時的辯論以后，談判有了轉折，沒用多久便達成了協議。 - It was not long before tragedy struck again.
沒多久，災難又再次降臨。
