The centre of pressure moves rearward and the aeroplane becomes unbalanced.
气压中心后移，这架飞机失去了平衡。
《柯林斯英汉双解大词典》
2
This results in an unbalanced condition which allows the main line pressure to lift the diaphragm off the main orifice and, thereby, open the valve.
在一个不平衡的状况，允许为主线的压力，解除了主要的孔隔膜，从而打开阀门这个结果。
3
In addition, unhealthy lifestyle is another potential risk; unbalanced diet, lack of physical exercise, pressure and depression, which result in sub-health.