Say for example, you have light enter a point on a surface, you then have the light continue to go through the object until it hits a back face, i. e. , it leaves the object.
譬如说，你轻点就进入了表面然后根据你继续办理，直到碰到一回面对象，即离开物体。
Arsenal go back on the road this weekend to face Blackburn - just 20 miles or so up the road from Old Trafford - and Wenger wants his team to rediscover their reputation.
本周末阿森纳将做客布莱克本，离老特拉福德仅有20英里左右的距离，温格希望他的球队能够重新证明自己的实力。
Arsenal go back on the road this weekend to face Blackburn - just 20 miles or so up the road from Old Trafford - and Wenger wants his team to rediscover their reputation.
本周末阿森纳将做客布莱克本，离老特拉福德仅有20英里左右的距离，温格希望他的球队能够重新证明自己的实力。
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