日本无码中文字幕片|日本精品在线观看无码视频|国产精品免费啪啪|Av无码一区二区|亚洲在线黄片免费观看|亚洲日韩中文字幕在线观看|熟女激情乱伦在线观看a黄片|成年人观看毛片网址|AV色色色色日韩性草|国产高清无码免费

¾GÉ«­h(hu¨¢n)±£Ó¢ÕZ×÷ÎÄ

•rég£º2025-10-11 16:29:03 ­h(hu¨¢n)±£×÷ÎÄ ÎÒҪͶ¸å

¾GÉ«­h(hu¨¢n)±£Ó¢ÕZ×÷ÎÄ

¡¡¡¡ÔÚÈÕ³£Éú»î»òÊǹ¤×÷ŒW(xu¨¦)Á•(x¨ª)ÖУ¬ÔS¶àÈ˶¼Œ‘ß^×÷ÎİÉ£¬Œ‘×÷ÎÄÊÇÅàðB(y¨£ng)ÈË‚ƒµÄÓ^²ìÁ¦¡¢Â“(li¨¢n)ÏëÁ¦¡¢ÏëÏóÁ¦¡¢Ë¼¿¼Á¦ºÍÓ›‘›Á¦µÄÖØÒªÊֶΡ£ÄÇÒªÔõôŒ‘ºÃ×÷ÎÄÄØ£¿ÒÔÏÂÊÇС¾Žžé´ó¼ÒÕûÀíµÄ¾GÉ«­h(hu¨¢n)±£Ó¢ÕZ×÷ÎÄ£¬¹©´ó¼Ò…¢¿¼½èèb£¬Ï£Íû¿ÉÒÔŽÍÖúµ½ÓÐÐèÒªµÄÅóÓÑ¡£

¾GÉ«­h(hu¨¢n)±£Ó¢ÕZ×÷ÎÄ

¡¡¡¡The area of desert in the world is growing every year. Many parts of the world which once had large populations and produced plenty of crops, have become deserts. Dunhuang in China, deep in the heart of the Gebi Desert, was once a great city.

¡¡¡¡Cattle are one cause of the problem. In good years, famers increase the numbers of their cattle. Then one year, the rains fail to come. The farmers do not want to kill any of their cattle, so the cattle eat ail the grass and anything that grows on poorer land. If this continues for several years, the grass never grows again and the land becomes a desert. One suggested answer is for farmers to limit the numbers of their cattle.

¡¡¡¡Another problem is that good soil is gradually lost. When trees are cut down, there is nothing to hold the soil in place on the hillside. So when if rains, the soil is washed down the hills and into the rivers. Strong winds can also blow away the valuable soil that lies on the top of the fields.

¡¾¾GÉ«­h(hu¨¢n)±£Ó¢ÕZ×÷ÎÄ¡¿ÏàêP(gu¨¡n)ÎÄÕ£º

¾GÉ«­h(hu¨¢n)±£×÷ÎÄ_¾GÉ«­h(hu¨¢n)±£¿ÚÌ–10-05

­h(hu¨¢n)±£µÄ¾GÉ«×÷ÎÄ07-31

­h(hu¨¢n)±£¾GÉ«×÷ÎÄ09-27

­h(hu¨¢n)±£¾GÉ«×÷ÎÄ02-22

¾GÉ«Åc­h(hu¨¢n)±£×÷ÎÄ02-22

­h(hu¨¢n)±£?¾GÉ«£¿×÷ÎÄ04-16

¾GÉ«­h(hu¨¢n)±£Ó¢ÕZ×÷ÎÄ£¨Í¨ÓÃ45ƪ£©10-29

¾GÉ«­h(hu¨¢n)±£µÄÓ¢ÕZ×÷ÎÄ£¨Í¨ÓÃ29ƪ£©04-23

¾GÉ«­h(hu¨¢n)±£µÄÓ¢ÕZÃûÑÔ150¾ä12-15

¾GÉ«­h(hu¨¢n)±£„ÝÔÚ±ØÐеĭh(hu¨¢n)±£×÷ÎÄ09-25