Earth had experienced previous periods of climatic change, and yet agriculture had not been developed.

地球已经历了先前的气候变化，但农业还没有发展起来。

youdao

He said he did not understand why on earth he, or they, had been fighting.

他说他不理解到底为什么他或者他的团要打仗。

youdao

Scientists now know, however, that the surface of the Earth is not as permanent as had been thought.

但是现在科学家们搞明白了，地球的表面不是像我们以为得那样一成不变。

youdao

Scientists now know,however, that the surface of the Earth is not as permanent as had been thought.

VOA: special.2010.01.12

And the reward for the poet's sacrifice here on earth is not simply eternal fame that had long been a privileged image.

诗人在世上的牺牲所带来的回报,不单是长久以来那个特权印象：百世流芳。

耶鲁公开课 - 弥尔顿课程节选

But the servant who had been given only one talent hid the talent in the earth so as -- perfectly understandably ] - so as not to risk the only talent that he had been given.

但只得到一枚金币的仆人,把他的金币藏了起来--这可以理解,-为了不使这个他仅有的,金币丢了。

耶鲁公开课 - 弥尔顿课程节选

The director of Friends of the Earth, Julian Rosser, said it had not been demonstrated that the new processes work completely effectively.

BBC: NEWS | UK | Wales | Welsh councils' incinerator trend

Jane Thomas, a campaigner at Friends of the Earth, said the business case for expansion had also not been made.

BBC: Heathrow third runway rethink urged by Tory MP

He said he did not understand why on earth he, or they, had been fighting.

ECONOMIST: Lazare Ponticelli