小學而大遺

to concentrate on trivial points while neglecting the main problem (idiom)

small / tiny / few / young

elementary school / primary school / CL:個|个[ge4]

to learn / to study / to imitate / science / -ology

and / as well as / and so / but (not) / yet (not) / (indicates causal relation) / (indicates change of state) / (indicates contrast)

see 大夫[dai4 fu5]

big; large; great / older (than another person) / eldest (as in 大姐[da4 jie3]) / greatly; freely; fully / (dialect) father / (dialect) uncle (father's brother)

to lose / to leave behind / to omit / to bequeath / sth lost / involuntary discharge (of urine etc)

(bound form) to leave behind