turn out to be

原来是，(最后)证明是

turn (sb/sth) over, turn (somebody) off, turn a blind eye to, turn against, turn around, turn aside from, turn away, turn away (from sb/sth), turn back, turn down, turn in, turn into, turn loose, turn off, turn on, turn on (light etc.), turn on sb, turn one's back on, turn out, turn out that (to be(do)), turn over, turn round (also turn around), turn sb's blood cold, turn sb/sth down, turn sth inside out, turn to, turn up, turn-about, turn-around (also turn-round), turn-off, turn-on, turn-out, turn-round, turn-up, turn...upside down, turncoat, turner, turning, turning-circle, turning-point,