If she has a bad run, and her score isn't good, she'll come and reach up and tap on the glass -- because she can't see the experimenter -- which is asking to have another go.
要是她这轮没玩好，得分太低， 她就会走过去，拍实验室的玻璃， ——因为她看不见实验员—— 她这是在要求再玩一轮。