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" ==== NERD tree
" Cmd-Shift-N for nerd tree
nmap <D-N> :NERDTreeToggle<CR>
" Open the project tree and expose current file in the nerdtree with Ctrl-\
nnoremap <silent> <C-\> :NERDTreeFind<CR>:vertical res 30<CR>
我可能不明白,鍵映射意味着:VIM NERDTree鍵映射
`nmap <D-N>` maps `D` - Mac Command key ?