To go head-to-head意思是两人之间头对头地竞争。
They're both amazing swimmers-I can't wait to see them go head-to-head.
There can only be one winner.We'll have to go head-to-head to decide who it is.
At this stage,either of them could win.It's neck-and-neck!
The head can send a wide variety of body language signals.A lowered head can be a defensive posture that occurs as a result of a perceived threat.Touching the face is often seen as a sign of anxiety and people have regular places they touch when they are worried.Our heads are quite heavy,so when we are tired we may use our hand and arm to prop it up.Sometimes when we are thinking,we may also prop up the head.