为什么有机会
Shiritori is a Japanese word game in which the players are required to say a word which begins with the final kana of the previous word. No distinction is made between hiragana, katakana, and kanji. "Shiritori" literally means "taking the end" or "taking the rear". 简单理解就是词语接龙。
竞争对手
可以看google 前两名的网站，页面都很一般。