a)如何指出当前研究的不足以及有目的地引导出自己的研究的重要性通常在叙述了前人成果之后，用However来引导不足，比如
However, little information..
little attention...
little work...
little data
little research
or few studies
few investigations...
few researchers...
few attempts...
or no
none of these studies
has (have) been less
done on ...
focused on
attempted to
conducted
investigated
studied
(with respect to)
Previous research (studies, records) has (have)
failed to consider
ignored
misinterpreted
neglected to
overestimated, underestimated
misleaded
thus, these previus results are
inconclisive, misleading, unsatisfactory, questionable, controversial..
Uncertainties (discrepancies) still exist ...
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化工药品名称（十四）