COPD相关的组织损伤也能导致肺排气显著的障碍，从而使人感觉呼吸短促。
COPD-related tissue damage can also make it particularly difficult to expel air from the lungs, which can make you feel short of breath.
针对某活塞式发动机排气管断裂现象，从断裂处焊接结构缺陷、焊缝组织缺陷和零件工作环境等方面进行分析。
The fracture failure of the piston engine exhaust pipe was analyzed from welding structure defects, welding structure defects and working environment etc.
对试生产的中硅钼合金蠕墨铸铁排气管铸件本体伸长率不足的原因进行了显微组织分析。
The reasons of low percentage elongation of mid Si Mo vermicular graphite cast iron exhaust tube casting in trial production were analyzed.
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