Why its different from Chinese?? because its Japanese xD Anyways, it is saying "「心中」ははじめ、他人に対して義理立てをする意味の「心中立」（しんじゅうだて）のことをいった。これが江戸時代になると、男女の永久の相愛を意味するようになる。" As reading this, 心中 was originately from a word "心中立" which means ”他人に対しての義理立て”. I believe that "義理" or ”人情" those are very tipical japanese human sense which may not be existing in other nations. Thats probably why, in Chinese, they have different meanings on 心中. Please refer the wikipedia page: http://ja.wikipedia.org/wiki/%E5%BF%83%E4%B8%AD This might help you to understand.

Japanese is different from Chinese because Japan and China are two different countries!!!!!!!!!!!!!!!!!!!!!

i just started learning kanji ... you have to wait ... for sometime ... would you tell me the use of "ga" and "da" in grammer