1. When the girl shook her head in bewilderment, Harry went on to explain it.
    当这个售货员为难地摇着头时，哈里继续解释.

2. When the woman shook her head in bewilderment,
    那个女售货员还是迷惑不解地摇了摇头。

3. For a long time, I watched them scurrying around the base of the tree in bewilderment.
    在很长一段时间里，我看见蚂蚁围着大树底部来回转悠，不知所措。