By happy coincidence, Robert met Richard and Julia and discovered they were experiencing similar problems.幸运的是，罗伯特碰巧遇到了理查德和朱莉娅，发现原来他们也碰到了类似的问题。The economy is experiencing an upturn.经济正在好转。Many poor households are experie...
The workmen are still busy concreting the road.工人们仍忙着用混凝土铺路。Anchor concreting is an effective support technique to control surrounding rock deformation and keep tunnel stability.锚杆注浆是一种行之有效的控制围岩变形和保证巷道稳定的支护技术.The workman...