自从重力铸造和低压铸造法问世 ，人们就认识到金属型涂料的重要意义。
Since the advent of gravity casting and low pressure casting methods, people have realized significance of metal coatings.
自从重力铸造和低压铸造法问世 ，人们就认识到金属型涂料的重要意义。
Since the advent of gravity casting and low pressure casting methods, people have realized significance of metal coatings.
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