本文记录了一个真机测试中出现的duplicate symbol错误，并给出了具体的错误信息。该错误涉及到LMZTopicModel类的重复定义，通过删除其中一个重复定义解决了该问题。
真机测试时报出的错误
duplicate symbol _OBJC_CLASS_$_LMZTopicModel in:
/Users/caihonghua/Library/Developer/Xcode/DerivedData/eVision论坛-gkxuvjhbtjpuqmgzmbygxplhekdl/Build/Intermediates/eVision论坛.build/Release-iphoneos/XXX.build/Objects-normal/armv7/LMZTopicModel-DDD2DF79CE518F5E.o
/Users/caihonghua/Library/Developer/Xcode/DerivedData/eVision论坛-gkxuvjhbtjpuqmgzmbygxplhekdl/Build/Intermediates/eVision论坛.build/Release-iphoneos/XXX.build/Objects-normal/armv7/LMZTopicModel-BFAB4D5739CAA188.o
duplicate symbol _OBJC_METACLASS_$_LMZTopicModel in:
/Users/caihonghua/Library/Developer/Xcode/DerivedData/eVision论坛-gkxuvjhbtjpuqmgzmbygxplhekdl/Build/Intermediates/eVision论坛.build/Release-iphoneos/XXX.build/Objects-normal/armv7/LMZTopicModel-DDD2DF79CE518F5E.o
/Users/caihonghua/Library/Developer/Xcode/DerivedData/eVision论坛-gkxuvjhbtjpuqmgzmbygxplhekdl/Build/Intermediates/eVision论坛.build/Release-iphoneos/XXX.build/Objects-normal/armv7/LMZTopicModel-BFAB4D5739CAA188.o
duplicate symbol _OBJC_IVAR_$_LMZTopicModel._picName in:
/Users/caihonghua/Library/Developer/Xcode/DerivedData/eVision论坛-gkxuvjhbtjpuqmgzmbygxplhekdl/Build/Intermediates/eVision论坛.build/Release-iphoneos/XXX.build/Objects-normal/armv7/LMZTopicModel-DDD2DF79CE518F5E.o
/Users/caihonghua/Library/Developer/Xcode/DerivedData/eVision论坛-gkxuvjhbtjpuqmgzmbygxplhekdl/Build/Intermediates/eVision论坛.build/Release-iphoneos/XXX.build/Objects-normal/armv7/LMZTopicModel-BFAB4D5739CAA188.o
ld: 3 duplicate symbols for architecture armv7
clang: error: linker command failed with exit code 1 (use -v to see invocation)
原因创建了两个LMZTopicModel，删除其中一个就OK勒
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