A crawler, device of girth welds testing outside pipeline is developed successfully.成功地研制了管道外检测机械装置—爬行器.The pool is divided into three sections with a crawler lane for beginners.泳池分三部分，有为初学者而设的慢泳道。The Google crawler does...
Spiders also attack the much - feared gypsy moth.蜘蛛也袭击令人害怕的舞毒蛾.It'showed strong adaptability in the growth potential and resisting gypsy moth.在生长势和抵御沙棘木蠹蛾危害方面表现出较强的适应性....