Fish pirates can easily land in ports that are not well controlled.
鱼盗能轻易地在一些没有有效控制的港口登陆。
The fish pirates can easily land in ports that are not well controlled.
鱼盗能轻易地在一些没有有效控制的港口登陆。
Due to the special structure of controlled direction well, it can lead to severe abrasion even jamming if not adopting any measure when using progressing cavity pump rod to pump oil.
由于定向井井身结构特殊，利用螺杆泵进行抽油时如不采取任何措施势必造成杆柱严重磨损甚至卡死。
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