time bomb

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The tasks facing Japan are staggering. But a country does not live on a geological time bomb without some accommodation by the national psyche.
虽然日本任重道远，但是处在这样一个危机重重地地理位置上，日本人的国民性必然有所适应。
The bomb consists of countries that have a combination of budget deficit and borrowings relative to GDP which puts them into the category “Time Bomb” or high risk of default.
这个炸弹的入选国的债务相对于GDP都非常高，随时都可能爆炸或主权违约。
Shortly after, a video uploaded on the Web shows a hooded man hanging in mid-air with a time bomb in plain sight. The message onscreen taunts the police to rescue the victim in time.
不久后，网路上载了一段录影，画面中是一个被绑在空中的蒙面人，房内赫然放置一个计时炸弹，录影透出信息，挑战警方在限时内救出受害者。
entertainment.xin.msn.com

It is a ticking time bomb for the federal budget.
I don't know whether they had intelligence of recent the car bomb in Time Square.
我不知道他们最近有没有搜集,时代广场的汽车炸弹的情报。
普林斯顿公开课 - 国际座谈会课程节选

The ticking time bomb in the American Dream is one little phrase: the pursuit of happiness.
FORBES: America's Childhood Fears
If you discard all financial implications, then Europe is a social ticking time bomb.
FORBES: Too Many Cuts, Not Enough Band Aids For The EURO

(BOMB) a bomb containing a device that makes it explode at a particular time
(DIFFICULT SITUATION) a situation that is likely to become difficult to deal with or control

A time bomb is a bomb with a mechanism that causes it to explode at a particular time.
If you describe something as a time bomb, you mean that it is likely to have a serious effect on a person or situation at a later date, especially if you think it will cause a lot of damage.