The luminous diode is arranged at the top of the projection, and situated at the focal point of the concave cup structure.
以及发光二极管设置于该支撑底座的顶端，并且该发光二极管位于该凹杯结构的焦点。
The luminous diode is arranged at the top of the projection, and situated at the focal point of the concave cup structure.
以及发光二极管设置于该支撑底座的顶端，并且该发光二极管位于该凹杯结构的焦点。
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