longitudinal instability

例句：

1. 1. The longitudinal instability of the bridgeis a concern for engineers.
   桥梁的纵向不稳定是工程师们关注的问题。
2. 2. Theaircraft's longitudinal stabilitywas compromised during the flight.
   飞机在飞行过程中纵向稳定性受到了影响。
3. 3. The researcher found that the longitudinalinstability of the material could beimproved by adjusting its composition.
   研究人员发现，通过调整材料的成分，可以改善材料的纵向稳定性。