叶轮可用角钢制成.The vanes are made of structural angle iron.这种装置的运转情况与叶轮泵很相似.This device operates similarly to the vane pump.叶轮有开式 、 半闭式和闭式三种, 如图 2-2 所示.Impeller are open, and closed three - Banbi, as shown in Figure 2 - 2 ....
He lay beside her awkwardly, propped on an elbow.他用一只胳膊肘支着身体，别扭地躺在她旁边。A moment or two later champagne in an ice-bucket materialized beside them.片刻之后，他们身边出现了一只装着香槟的冰桶。Brian didn't like it, but that was beside the poi...
她技艺高超，操作着复杂的提花织布机。A first-class worker, she operated the difficult Jacquard looms.那家工厂有25台织布机.The factory has twenty - five looms.我每天都坐在织布机旁边织这块布.I will sit at my loom and weave the web....
The river is navigable by vessels of up to 90 tons.90吨以下的船只可以从这条河通过.The lower reaches of the river are navigable for steamers.这河的下游能够行驶轮船.The river is navigable now.河开了....
The lighthouse beam was quite distinct in the gathering dusk.灯塔的光束在渐浓的暮色中清晰可见。Dr Ryan travelled the world gathering material for his book.瑞安博士周游世界为他的书搜集资料。Many of the machines are gathering dust in basements.许多机器尘封在地下室里。...