许多父母担心孩子吸手指会影响牙齿发育。

Many parents worry that ___thumb-sucking may affect their child's teeth development.

她总是依赖父母做决定，这种心理上的依赖就像成年人的吸拇指行为。

She always relies on her parents for decisions—this psychological dependence is like adult ___thumb-sucking.