Based on paraxial meridian-ray equation, the principle of fibre accelerometer using self-focussing lens is studied;
本文根据近轴子午光线方程，研究了自聚焦透镜光纤加速度计的工作原理；
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Mind chief executive Paul Farmer said focussing on problems or insecurities can lead to feelings of hopelessness, low self-esteem and even mild depression.