Less than one degree Celsius of warming since the pre-industrial age has unleashed frightening and unforeseen change, including glacier-melt and unprecedented coral-reef degradation.
自工业化时代刚开始以来，不到1摄氏度的升温引起的环境变化是令人可怕、出人意料的，其中包括冰川消融和前所未有的珊瑚礁退化。
The essential procedures consist of alloy melting, preheating pre crystalizer, melt stirring and oscillation, solidification and drawing.
其基本过程包括合金熔炼、预结晶器预热、熔体搅拌和振动、凝固拉坯等基本环节。
For shrinkage and sink reduction, molds can be pre-pressurized with gas before melt is injected, or gas can be introduced between the non-appearance side of the part and the mold.
为了减少收缩和塌陷，在填充前可以用气体给模具加预压，或者可以在非表观面与型腔表面之间注入气体。
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