翻译:台上芭蕾舞女演员看似(或:看起来)一般高.
seemingly(adv):看似、看起来,副词可放在句首、句中或句尾;更可省略、且省略后基本意思微变、而结构完整、语法无误——The onstage ballerinas are of the uniform height.(主+系+表,完整)
题外:将seemingly放在句子各处,试比较——
句首:Seemingly(=It seems that) the onstage ballerinas are of the uniform height.
句中:The onstage ballerinas are seemingly of the uniform height.
句尾:The onstage ballerinas are of the uniform height seemingly(台上芭蕾舞女演员一般高,看起来是这么样.)这种表述较少见.