1. The toughness may be well improved by postheat treatment which is large in energy consumption and long in working period.
   焊后热处理可以较好地改善焊接接头的韧性，但存在耗能大、工时长等问题。

声明：以上例句、词性分类均由互联网资源自动生成，未经过人工审核，其表达内容亦不代表本软件的观点；若发现问题，欢迎向我们指正。