日本高清色视频在线视频在,国产香蕉97碰碰视频碰碰看,丰满少妇av无码区,精品无码专区在线,久久无码专区免费看,四虎欧美精品永久地址99,亚洲色无码一区二区三区

媒體英語會帶大家一起學(xué)習(xí) BBC 撰稿人在報道世界大事時常用到的單詞和短語。

《自然氣候變化》期刊最新發(fā)表的一項研究指出全球氣候變暖助長了農(nóng)作物病蟲害發(fā)生程度加重。?？巳睾团＝虻拇髮W(xué)的研究人員發(fā)現(xiàn)，隨著氣候變暖，農(nóng)作物害蟲正在朝南北兩極方向移動。以下是 BBC 記者 Rebecca Morelle 的報道：

The researchers looked at more than 600 crop pests from around the world.

These included fungi, such as wheat rust, which is devastating harvests in Africa and the Middle East; insects like the mountain pine beetle that's destroying trees in the US; as well as bacteria, viruses and microscopic nematode worms.

They found that over the past 50 years, these destructive species have been on the move. On average, they're spreading 3km every year, shifting north and south towards the poles.

The scientists say this correlates with warming temperatures, allowing the pests to take hold in areas that were once too cold for them to live in.

Currently, between 10% and 20% of the world's crops are lost to pests - and the team warns that rising global temperatures could make the problem worse. The researchers say that improved surveillance of the problem is needed.