系统产生的黑色沉淀物主要由硫化铁和氧化铁构成；
The black deposits produced in the system were mainly composed of iron sulphide and iron oxide.
绝对黑色镜片在常规制作镜片过程中加入氧化铅和氧化铁一起熔炼而制成。
Said absolutely black lens is made up by addition of lead oxide and iron oxide during its manufacture.
绝对黑色镜片在常规制作镜片过程中加入氧化铅和氧化铁一起熔炼而制成。
Said absolutely black lens is made up by addition of lead oxide and iron oxide during its manufacture.
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