焊接温度场以其为焊接过程最直接的外在表征而成为焊接过程研究的一种常用的研究手段。
Study on temperature field is a common method to study welding process because it is one of direct token of welding process.
虽然该研究有益于视觉学习和课堂教学，但我们仍需在理论原理和概念区分方面对知识的外在表征特性展开更多的研究以促进其在教学中的应用。
Although it is beneficial to visual learning and classroom teaching, it is necessary to do more research in knowledge representation in perspectives of theories and concepts.
水是外在的物质，受洗时借着浸水礼，表征洁净与更新。
The water is external, a sign of the renewing and purifying through regeneration used in baptism.
水是外在的物质，受洗时借着浸水礼，表征洁净与更新。
The water is external, a sign of the renewing and purifying through regeneration used in baptism.
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