how to import cdn css in .scss

[chavesgu]

• NPM version (npm -v):5.6.0
• Node version (node -v):8.9.4
• Node Process (node -p process.versions):{ http_parser: '2.7.0',
  node: '8.9.4',
  v8: '6.1.534.50',
  uv: '1.15.0',
  zlib: '1.2.11',
  ares: '1.10.1-DEV',
  modules: '57',
  nghttp2: '1.25.0',
  openssl: '1.0.2n',
  icu: '59.1',
  unicode: '9.0',
  cldr: '31.0.1',
  tz: '2017b' }
• Node Platform (node -p process.platform):darwin
• Node architecture (node -p process.arch):64
• node-sass version (node -p "require('node-sass').info"):4.9.0
• npm node-sass versions (npm ls node-sass):4.9.0

how to import cdn css in .scss？
when i use @import url('some cdn');
throw error can't find path;
but i use this in style lang='scss' it work success
why?

[nschonni]

Importing CSS directly into CSS isn't supported and was removed in the latest release. You can read the details in #2362