Spherical Aberration — causes light rays passing through a lens (or reflected from a mirror) at different distances from the optical center to come to focus at different points on the axis.

球差-使以不同孔径角穿过透镜(或从镜面上发射)的光线不能聚焦在轴上的同一点。

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Light lateral and axis and torsion vibrations do not affect the normal work, but the resonance state has severity effect to drill string.

轻微的横向、轴向及扭转振动不影响钻井的正常作业，而钻柱的共振状态会对钻井产生严重的影响。

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The demonstration daughterboard contains temperature and light sensors, a three-axis accelerometer, eight tricolour LEDs, and two pushbutton switches.

演示子板包含温度和光传感器、一个三轴加速计、8 个三色 LED 以及两个按钮开关。

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It combines an Arduino-compatible processor with a light sensor, a temperature sensor, a 3-axis accelerometer, a joystick, a set of pushbuttons, a slider, an RGB LED, and a buzzer.

ENGADGET: Arduino Esplora helps you learn microcontrollers without the pesky breadboard