The following points were emphasized: the hollow structure of core can improve yieldability and reduce the shrinkage stress;
要强调以下几点：提高型芯的退让性，以减小收缩应力，将芯子做成中空结构效
明显；
The following points were emphasized: the hollow structure of core can improve yieldability and reduce the shrinkage stress;
要强调以下几点：提高型芯的退让性，以减小收缩应力，将芯子做成中空结构效明显；
声明：以上例
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