她对环保问题的态度突然来了个180度大转弯。

Her complete ___turnabout on environmental issues surprised all her friends.

我帮你搬家，下次你也应该帮我，这才算公平交换。

I helped you move, so it's only fair ___turnabout that you help me next time.

风筝突然来了个180度的转弯，朝着相反的方向飞去。

The kite suddenly did a sharp ___turnabout and flew in the opposite direction.