数百万只蝗虫绵延数千米，每天爬行500米，咀嚼一切挡在它们面前的东西。
Millions of juveniles crawl up to 500 metres a day, munching everything in front of them, in bands that stretch for kilometres.
目前，回转窑所用的挡轮液压缸存在的问题是内泄大、密封失效、产生爬行及使用寿命低等。
At present, the problems of hydraulic cylinder is about serious internal leakage, seal failure, crawling and the short service life.
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