R报错Error: unexpected symbol in

有好兄弟知道为什么会怎样吗，单独运行一行就可以，运行两行就报错了

R报错Error: unexpected symbol in:XXX及解决办法_r语言unexpected symbol_双仔宝贝的博客-CSDN博客 R报错Error: unexpected symbol in:XXX及解决办法 https://blog.csdn.net/sscuiyjd/article/details/127445972