If you have difficulty sitting like this, prop up your back against a wall.如果这么坐着有困难，就背靠墙坐吧。A worker put a prop against the wall of the tunnel to keep it from falling.一名工人用东西支撑住隧道壁好使它不会倒塌.He used a box to prop the door o...
These can range from lighting dimmers and climate control systems to security and audiovisual appliances.这些设备包括从调光器、气候控制器到安全装置和音像设备.Would you please tell me how much this audiovisual disk is?请问这种声像带多少钱一盘?Some libraries c...