As is the custom, police forensic experts carried out a painstaking search of the debris.
像往常一樣，警方的.法醫(yī)專家對殘骸進(jìn)行了仔細(xì)的查看。
The mastery of a language requires/ needs painstaking effort.
要學(xué)好一種語言，必須下苦工夫。
I don't know how to make polite conversation.
我不曉得怎么說應(yīng)酬話。
He had always been polite ─ she couldn't fault him on that.
他總是彬彬有禮——她在這方面對他無可指摘。