He only USES the hand signal and she converses, Possible she tobe able to read his each look.

他只用手势和她交谈，可能她能读懂他的每一个眼神。

youdao

What happened in that case is he has learned that the raising of a hand is a signal that he is about to be hit and so he responds to that signal.

在这个例子中，他知道,举起的手臂是他即将挨打的信号,因此他对这个信号作出了反应。

耶鲁公开课 - 心理学导论课程节选

After the publication of the book, a drama scholar wrote to Mr. Unsworth asking for his source on the hand-signal system.

WSJ: A Tribute to Barry Unsworth | Dear Book Lover

Long before my translator - who is switching form Greek to Arabic to French - gets it right, Mr Lamhoud's hand movements signal what happened.

BBC: Greece asylum: Journey through a broken system

Thompson turned around in time to watch it fly toward a row of defenseless photographers sitting on the baseline, and then raised his hand to signal it was his team's ball since he hadn't touched it last.

WSJ: One NBA Player's Life of Constant Rejection: Tristan Thompson