lacking theory basis 缺乏理论依据
relevant theory rather lacking 相关理论比较缺乏
theory lacking
理论的缺乏
以上为机器翻译结果，长、整句建议使用 人工翻译 。
In theory, this would allow the implantation of nerve cells that produce dopamine--a chemical that is lacking in the brains of Parkinson's patients.
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