A textboard is a simple kind of internet forum that does not require registration. While popular in Japan, they remain relatively unknown outside of it, in contrast to imageboards (such as 4chan).
textboard:
text +? board
英汉双解词典包含3185865条英汉词条，基本涵盖了全部常用单词的翻译及用法，是英语学习的有利工具。