directional solidifica-tion 基本例句 定向凝固 Water cooling circuits provide rapid, and directional solidification.水冷循环提供迅速定向凝固。 Phase and structure selection of peritectic alloys under directional soildification is a complex problem.包晶合金定向凝固过程中的相和组织选择是一个复杂的过程。