定義：properly, to front, i.e., stand boldly out opposite; by implication (causatively), to manifest; figuratively, to announce (always by word of mouth to one present); specifically, to expose, predict, explain, praise
定義：to tend a flock; i.e., pasture it; intransitively, to graze (literally or figuratively); generally to rule; by extension, to associate with (as a friend)
