Plans called for the operation to last just a few weeks.

要求行动的计划只持续了几周。

Such enhancements of the market price are evidently the effects of particular accidents, of which, however, the operation may sometimes last for many years together.

市场价格的这种上涨显然是特定事故的结果，然而，其作用有时可能会持续多年。

But officials here would not say how long the operation will last, nor whether there will also be a ground offensive by troops which have been moving close to the Gaza border with tanks and artillery.

但官方并未透露战斗将持续多久，以及装备了坦克和炮弹并快速向加沙边境转移的部队何时发起地面进攻。