A: It's hard for Janet to change her mind.
B: Yes, but Prof. Green can make her do that.
A: Why is that?
B: Because Prof. Green has her ear.
have one’s ear
exp。 To gain the attention of somebody important in order to influence them or get their help。（对某人有影响力）
e.g. That suggestion of yours might just become a reality—I do have the CEO's ear, you know.
e.g. We’ll have to have the ear of 安徽快三the Senator to win support for our cause.