p开头的形容词名词英文

　　As is the custom, police forensic experts carried out a painstaking search of the debris.

　　像往常一样，警方的.法医专家对残骸进行了仔细的查看。

　　The mastery of a language requires/ needs painstaking effort.

　　要学好一种语言，必须下苦工夫。

　　I don't know how to make polite conversation.

　　我不晓得怎么说应酬话。

　　He had always been polite ─ she couldn't fault him on that.

　　他总是彬彬有礼——她在这方面对他无可指摘。