B 311 lithopone: white paint, zinc sulfide content of 30 %.是什么意思？

B 311 lithopone: white paint, zinc sulfide content of 30 %.

B311立德粉: 白色颜料, 硫化锌含量为30%.

lithopone

n. 锌（用做涂料等的）钡白；

例句
Purpose: Mainly used in lithopone and material in potass, and widely used in agriculture and light industry.
用途: 用于制造锌钡粉和其他锌盐的原料,还广泛应用于农业与轻工业, 用作肥料、饲料添加剂等.

white

adj. 白色的，纯洁的，无色的，透明的，白衣的，白种人的；n. 白色，白种人，空白，白色颜料；vt. （书写，印刷等）留出空白处，使变白色，刷白，漂白；

例句
Washington has been abuzz with stories about disarray inside the White House.
整个华盛顿都对白宫内发生的混乱议论纷纷。

paint

n. 颜料，涂料，绘画作品，胭脂等化妆品，色彩，装饰；vt. 涂色于，绘画，（用语言，文字等）描写，擦脂粉等；vi. 描绘，绘画，化妆；

例句
The cracks are showing in the walls and a lick of paint would not come amiss.
墙面开始出现裂缝了，刷一点油漆就能补好。

zinc

n. [化]

例句
The result shows zinc enrichment phase makes alloy dissolve accelerative and uniformly.
结果表明,富锌相的存在使得合金溶解加速,溶解较为均匀.

sulfide

n. <化>硫化物；

例句
They'd have a lot of hydrogen sulfide gas bound up in their cells.
他们的牢房里有大量的硫化氢气体。

content

n. 内容，（书等的）目录，满足，容量；

例句
It contains less than 1 per cent fat, an appreciable amount of protein, and a high content of minerals...
它所含脂肪不到1%，富含蛋白质，矿物质含量也很高。

of

prep. 关于，属于…的，由…制成；aux. 助动词 [非标准用语、方言] =have [主用于虚拟语气]；

例句
He did have a real knowledge of the country...
他对该国的确知之甚多。