空气进入系统：如果空气进入液压系统，就会产生制动不良和踩下踏板不能产生制动力。
Air in system. If air gets into the hydraulic system, poor Braking and a spongy pedal will result.
作者认为低血容量，髓内压增高及制动不良与脂栓征发病密切相关。低血氧症是较可靠及敏感的早期诊断指标。
The authors believe that the occurence of FES was in close relation to the hypovolemia, elevation of intramedullary pressure, and unsatisfied immobilization.
通过计算和试验，对铁路货车提速转向架组合式制动梁缓解不良问题进行了分析，提出了影响因素和改进方案。
The bad release of the composite brake beam in speed increased bogies for railway freight cars is analyzed through calculation and test.
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