If your behaviour or motives are altruistic, you show concern for the happiness and welfare of other people rather than for yourself. 利他的
adjective [原级] 利他主义的，无私的
Couch surfers tend to see themselves as part of a tribe; unlike two people hooking up at a bar, they meet under an altruistic premise. 沙发冲浪者视自己为一个部落的成员；不像在酒吧里面邂逅的两个人，他们是在利他主义的前提下相遇。
后缀: istic
【adjective】 信仰…的，从事…的 - indicating a person who practices or supports a particular belief or activity
原词: altruistic
是通过后缀 【istic】 构成的派生词
