They get caught in trees (hence the epithet "Witches' Knickers"), take hundreds of years to decompose and push up demand for oil, used to make plastics.

它们挂在枝头（由此而得“巫婆的灯笼裤”之名），需要数百年才能分解，它们助长石油需求，正是石油用于制造塑料。

youdao

Over the past forty years, China planted billions of trees as part of its fight against expanding deserts, mostly in its north.

在过去的四十年，中国种植了数十亿的树木来作为主要遏制北方沙漠延伸的举措之一。

youdao

People in this city have planted lots of trees in the last few years.

在过去的几年里，这个城市的人们种了很多树。

youdao

After about five years, cacao trees start producing large fruits called pods, which grow near the trunk of the tree.

VOA: special.2010.02.17

Over the years, an agricultural adviser named Tony Rinaudo has helped people in the Sahel learn about the value and care of trees.

VOA: special.2011.05.10

They found that over a period of six years, planting three rows of trees reduced total dust and ammonia by more than half.

VOA: special.2009.09.08

He used to come here as a child 30 years ago and remembers mountains full of trees and grazing deer.

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The Lord's Acre appears to have remained an orchard and kitchen garden to the castle's occupants for around 350 years, and many of the fruit trees there date from between 1300 and 1600.

BBC: Bid to transform historic Lord's Garden in Ruthin

Within 15 years, upward of half a million birch trees have replanted on their own.

WSJ: Scotland's Cawdor Estate