Light sent into the oil layer was confined there, bouncing between the metal and air boundaries. The beam spread out ever more quickly, generating a trumpet-shaped glow (see image).
当把光传入油层后，就被约束在那里，光线在金属和空气的边界之间不断反弹，于是产生了喇叭状的辉光(见图片)。
The beam does not spread out appreciably, even at large distance from the source.
它的光束，即使离光源极远，也不显著扩散。
Fache backed away from the body and raised the black light again, letting the beam spread out in a wider Angle.
法希从尸体旁向后退了退身，再次高举起黑光灯，使光线从更大的角度散发出来。
Fache backed away from the body and raised the black light again, letting the beam spread out in a wider Angle.
法希从尸体旁向后退了退身，再次高举起黑光灯，使光线从更大的角度散发出来。
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