• 1. 前提反射: conditioned reflex
• 2. 提前反射: Early Reflection

• 1.本文在基本不改变仪器固有灵敏度的前提下，采取记录光线二次反射法，以提高仪器的记录灵敏度。
  In this paper we describe a method to improve the recording sensitivity by twice reflections of light ray without changing the inherent sensitivity of the instrument.
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• 2.这种结构在保持了高透射率的前提下还具有金属的优点，这在传感器、护目装置、反射窗、液晶显示等诸多领域都有很大的实用价值。
  The structure has high transmission and metal's advantages, so it can be used in many fields as sensor, eye protection devices, heat reflecting Windows and liquid crystal displays.
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• 3.在能够获得桩底反射的前提下，脉冲宽度和敲击速度尽量小。
  The pulse width and impact velocity as small as possible on the premise that can obtain reflection from the pile toe.
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