求翻译：因此，笔者根据Seeing the doctor 这个话题的交际性能强，实际运用广等特点，将本单元的教学策略重点定位在三个教学环节上，即，Presentation, Practice 和 Production上，将“激发兴趣，激活思维，轻松导入；读后仿说，逐层训练，强化能力；创设情景，迁移知识，实现交际”作为本单元设计的导向。是什么意思？

Therefore, author under Seeing the doctor this topic of communication performance strong, actual application wide, features, will this unit of teaching policy focus positioning in three a teaching links Shang, is, Presentation, Practice and Production Shang, will "fired interest, activation thinking, easily import; read Hou imitation said, by layer training, strengthening ability; creating scene, migration knowledge, implementation communication" as this unit design of oriented.