The objective of sand reclamation is make good casting, not to reclaim sand to a given level of cleanliness.
砂再生的目的是用再生砂生产出好铸件，而不是将砂再生到指定的干净程度。
The objective is to remove partially (NOT COMPLETELY) the original paint. By using sand paper, the dark brown will be removed and you'll see a lighter paint appear.
这一步的目的就是要清除一些原色（不是全部），用砂纸磨过后，深褐色就会消失，浅褐色就会显现出来。
Objective to study the impact of the sand dust storm on the incidence rate of respiratory diseases.
目的探讨沙尘暴对呼吸系统疾病影响的特点和规律。
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