一概而论: to generalize about that

以一鳞而识全貌: 在中文里有很多类似的说法，如
窥一而知三，窥一而知十，窥一而知全貌，闻一知十，窥一斑可知全貌，窥一斑而见全豹，一叶知春。

By collecting information about the first signs of spring, scientists can build the most complete picture of the season.

一叶知春：Spot the signs of spring

Despite the risks, drivers usually push themselves beyond their requirements for sleep. The desire to get to the destination as soon possible can override any precautionary thoughts of taking a break - these drivers are at risk from themselves. Here are some signs for drivers****** to spot the signs of fatigue and take decisive action. Research has defined the following list as high-risk symptoms associated with drowsy driving

以一鳞而识全貌 是說在只見過一部分的前提下, 就假定其餘的也是ㄧ樣的, 而事實上可能洽洽相反.

-- we should not generalize from limited evidence

-- we should not overgeneralize as evidence remains fragmentary

FYI:

Amy deIpolyi MBB Thesis Abstract DraftWe found limited evidence that tamarins can understand "middle" and generalize this concept to a certain extent, but we were prevented from making general ...
www.wjh.harvard.edu/~mnkylab/ theses/AmyDeIpolyi/abstract.html - 4k - Cached - Similar pages


Chapter I - Introduction[C] =, Limited evidence is defined as evidence from at least one study that met ... Therefore, it is almost always necessary to generalize to some extent in ...
www.health.state.ny.us/community/infants_children/ early_intervention/autism/chapter1.htm - 31k - Cached - Similar pages

Definition of overgeneralize - WordReference.com Dictionaryovergeneralize Definition from dictionary. ... draw too general a conclusion; "It is dangerous to overgeneralize". Category Tree: ...
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overgeneralize - definition of overgeneralize by the Free Online ...Definition of overgeneralize in the Online Dictionary. Meaning of overgeneralize. What does overgeneralize mean? overgeneralize synonyms, overgeneralize ...
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Young children's overgeneralizations with fixed transitivity verbs.Children at all ages were more likely to overgeneralize usage of verbs that were less familiar ... Verbal Learning PMID: 10621959 [PubMed - indexed for MEDLINE]
www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve& db=PubMed&list_uids=10621959&dopt=Abstract - Similar pages

Why not retain the literal meaning while adding a figurative translation?

“However, just as one cannot see the whole fish by looking at a single scale, one cannot make a diagnosis based on limited/partial/incomplete/one-sided information...”

I know this needs work but you get the gist of it.