由热处理后试样冲击断面的SEM照片可见水分挥发留下的空洞，这些空洞容易形成应力集中点，因而导致冲击韧性降低。
Many round voids which result in stress concentration easily are found on SEM micrographs of fracture surface after heat-treatment, so the notched izod impact strength of the sample decreases.
由热处理后试样冲击断面的SEM照片可见水分挥发留下的空洞，这些空洞容易形成应力集中点，因而导致冲击韧性降低。
Many round voids which result in stress concentration easily are found on SEM micrographs of fracture surface after heat-treatment, so the notched izod impact strength of the sample decreases.
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