skin-deep
adjective uk/ˌskɪnˈdiːp/ us/ˌskɪnˈdiːp/
肤浅的，表面的
not carefully considered or strongly felt
After the first half-hour she realized that her new-found confidence was no more than skin-deep. 仅半个小时后，她就意识到自己新建立起的信心不过是表面上的。
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