内外空
内外空-
据知，目前为止国内外学者对空环的研究还不算多；而从认知角度，针对新闻语篇中的空环现象进行的研究更是少之又少。
Through literature review , it is found that , up to now , the study of missing links is not much documented both at home and abroad . The study of missing links in news discourse from a cognitive perspective is even less .
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外壳采用铝合金压铸，表面喷塑固化，内外壁耐抗空压机的合成润滑油腐蚀。
The shell adopt aluminium alloy die casting , the surface is plastic-sprayed for resistance .