One of the advantages of modern irrigation methods is that they alone can save 20-30 percent of the present volume of wasted irrigation water.

现代灌溉方法的优点之一是，仅凭它们就可以节省目前灌溉用水浪费量的20%-30%。

youdao

That book forms a companion to the present volume.

那本书与现有的一册成为姐妹篇。

youdao

That book forms a companion to the present volume.

那本书与现有的一册成为姊妹篇。

youdao

Kenneth Widmerpool is present from his emergence in the first volume out of the mist on a school run to his bizarre death in the last volume.

ECONOMIST: Anthony Powell

About 100 million years ago, sea levels were about 300 metres higher than at present because of changes in the volume of ocean basins due to movement by the Earth's techtonic plates.

BBC: Looking for the greenhouse signal

Although coal does not often contain high concentrations of mercury, the authors say the "combination of the large volume burned and the fact that a significant portion of the mercury present is emitted into the atmosphere results in large overall emissions from the sector".

BBC: UN: Rising mercury emissions increase risk to humans