另外一种变化可能发生在人类学会制备食物尤其是通过烹饪制作食物的时候。
Another shift likely occurred when humans learned to prepare food, specifically through cooking.
研究了真空渗流法制备泡沫镁合金的工艺，具体包括填料的选择，预制块的制作和真空渗流三个部分。
The preparation process of foam magnesium alloy by vacuum infiltration, which includes the choice of filling, fabrication of prefabricated block and vacuum infiltration, was studied.
蒸镀不仅能制备引线，同时也是传感器件敏感膜制作的主要手段。
Evaporating not only can prepared leader, but also is the main means to make sense film of sensor components.
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