long time

长期的, 持久的

例句与用法：

It is true that these changes take a long time, but not as long as we might expect.

这些变化需要一些长的时间是事实，但不像我们所可能预期的那样久。

He has been grappling with the problem for a long time.

他长期以来一直努力解决该问题。

He had been ill for a long time and consequently he was behind in his work.

他病了很久，因此耽误了功课。

I don't know him well though I've known him for a long time.

我对他并不了解，虽然我认识他已经很长时间了。

It's been a long time.

好久不见了。

For a long time special observations were made of these gases under different pressure and temperature.

人们对这些气体在不同压力和温度下的变化做了长期的专门观察。

Continuing or lasting for an indefinitely long time.

长期的，长久的继续或保持无限长的时间的

It is a great relief to have rain after a long time of drought.

长期的乾旱之后有雨是一大慰藉。