Another warning sign of a medical emergency is difficulty breathing. This could mean a heart condition. Or there could be a hole or a blockage in a lung.
另一个急救的警告信号是呼吸困难。这可能是心脏的问题，或者可能是肺部有孔或是堵塞。
For example on the products of a hole, it might be of no great importance for practical and technical personnel, if not it may mean more products will be produced by casting.
例如产品上的某个孔，对于实际技术人员来讲可能无关紧要，如果没有它可能愈味着产品将无法通过铸造制造出来。
The development and application of this device provided a necessary mean for the slim hole track measurement and directional window cutting.
它的开发、应用成功，为小井眼、短半径井的井眼轨迹测量、斜向器定向开窗作业提供了必备的测量手段。
应用推荐