他强调说，中国不但是一个经济大国，同时还是一个在某些区域和国际问题方面扮演重大角色的重要国家。
He stressed that China is not only a big economic power, but an important country which plays a significant role in some regional and global issues.
所要解决的技术问题是将LED芯片小角度区域光转换到大角度区域，以达到均光的效果。
The technical problem to be solved is to convert the light of a small-angle area of an LED chip to a large-angle area so as to achieve the effect of light equalization.
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