「所有深爱都是秘密」的字体是一种典雅、流畅的宋体。宋体是汉字书写中常用的字体之一，它的笔画清晰、端庄大方，非常适合书写正式、高雅的文字。在「所有深爱都是秘密」这句话中，这种宋体字体的运用，更加突显出这句话的深意和庄重感。
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