blue ocher是什么意思

用法例句

LanZhou railway machinery and electricity factory is a professional enterprise whose core business is in manufacturing accessories for internal-combustion locomotive engine and the electric power motorcycle.

兰铁机电工厂是从事内燃、电力机车配件制造的专业化企业，在不断变化的经营环境中正面临着新的机遇与挑战。