珪

本研究发现各种结晶型二氧化珪（SiO2）的密度与其毒性和致纤维化程度密切相关。

It was found that the toxicity and the fibrogenic action of various kinds of crystalline silica were fairly correlate to their density .

南宋以李唐、刘松年、马远、夏珪为代表的院体画家，开始尝试山水画新的表现形式，他们着意于章法布局的构思，特写边角之景。

South sung dynasty painter , Li tang , Liu song nian , Ma yuan Xia gui start trying the landscape painting new manifestation , They attract by to set up in the composition of conceive outline , close-up side the view of the Cape .