Boston ivies crawl along the wall.爬山虎在墙上蔓延.She slowed the car to a crawl.她把车开得很慢。I began to crawl on my hands and knees towards the door...我开始手脚并用朝门口爬去。Don't worry if your baby seems a little reluctant to crawl or w...
Conversely, test made in full - scale boilers are usually difficult to reconcile.与此相反, 在工业规模的锅炉内所做的试验,也难于互相一致.Most boilers have a lifespan of 15 to 20 years.绝大多数锅炉有15至20年的使用期限。The clean coal is sent to a crusher and the ...