Use different colours of felt pen on your sketch to avoid confusion.用不同颜色的毡头笔画草图，以免搞混。...

felt pen的音标：felt pen的英式发音音标为：[felt pen]felt pen的美式发音音标为：[fɛlt pɛn]...

n.毡头笔，水笔 （油墨）毡笔...