阿司匹林可引起胃出血，所以不应该没有医生的监督措施。
And aspirin can cause stomach bleeding so it should not be taken without a doctor's supervision.
由于信息不对称，委托人（病人）自始至终无法也没有激励机制去监督代理人（医生）行为。
Because of the asymmetric information problem, the principal (patient) is unable and without incentive to supervise the agent 's (doctor's) activities from begiming to end.
患有帕金森或左旋多巴的人，不应使用甲基供体像甜菜碱，在没有医生的具体审批和监督的情况下。
People with Parkinson's or taking L-dopa should not use methyl donors like TMG without a physician's specific approval and supervision.
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