Opponents object that, in general, laypersons lack the specialized knowledge to evaluate such advertisements and might ask their physicians for inappropriate medications.
反对者反对说，一般来说，外行缺乏评估此类广告的专业知识，可能会要求他们的医生提供不合适的药物。
2
That lack of curiosity produces a relative lack of knowledge, and the lack of knowledge is difficult if not impossible to compensate for later on.
好奇心的缺乏导致了相应知识不足，而知识的缺乏即便可以弥补，但真正做到也是很难的。
3
There is a lack of knowledge about the tax system.