The tower of Pisa leans at an angle .比萨斜塔塔身倾斜。Did you pay a visit to the leaning tower in Pisa while you were in Italy?你在意大利期间参观了比萨斜塔 吗 ?The Leaning Tower of Pisa is famous for tilting toward the southwest.比萨斜塔因为倾向西南而闻名....
抽气泵的排气管应该导向室外空旷处或导向一座通风橱.The pump exhaust should lead to the open air or a fume hood.设计了一套硅片专用真空夹紧装置,包括夹紧装置和微型无油真空抽气泵.A vacuum clamp equipment used for holding Si wafer is designed in this paper....