sometimes used with nouns to make a new adjective meaning that something helps or does not harm a particular type of person or thing （有时与名词连用构成形容词）表示“向…提供帮助的，不伤害…的”
the campaign for wildlife-friendly farming 保护野生生物的农垦运动
Science teachers need to take a more girl-friendly approach (=that helps girls to be interested in science) . 教自然科学的教师需要采用更能激发女生兴趣的教学方法。