不稳定条件 meaning in English

instability condition
unstable condition

Unesco gala for unesco s programme for the education of children in need , 12 november 2005
为筹备处于不稳定条件下的儿童的教育计划unesco晚宴， 2005年11月12日
A study to the trigger mechanism and unstable conditions of spring heavy rainfall with numerical simulation
一次春季暴雨不稳定条件和对流触发机制的数值模拟研究
When the axial speed varies harmonically about a constant mean one , the method of multiple scales is applied to the axially moving beam to determine the instability boundary due to parametric resonance
当轴向运动速度在其常平均值附近作简谐波动时，应用多尺度法给出轴向变速运动梁参数共振时的不稳定条件。