Only the source material (passage) will change.
只有材料的来源（文章）将改变。
In batch distillation, the composition of the source material, the vapors of the distilling compounds and the distillate change during the distillation.
间歇式蒸馏时，原料的成分、所蒸馏的化合物的蒸汽及蒸馏物在蒸馏过程中是变化的。
Cost down: Development cost-down affairs, such as open second source suppliers, change parts material, optimize parts' structure.
降低成本：开发第二供应商，替换材料，结构优化等；
Cost down: Development cost-down affairs, such as open second source suppliers, change parts material, optimize parts' structure.
降低成本：开发第二供应商，替换材料，结构优化等；
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