Resharper 提示”lambda expression to statement”

最近用上了resharper，实时对代码进行改进，碰到这么一个提示“lambda expression to statement”,那什么是lambda expression，什么是lambda statement？二者有什么区别？

Expression：
var exprBooks = books.Find(book => book.Author.Contains("Fowler"));

Statement:

var stmtBooks = books.Find(book => { return book.Author.Contains("Fowler"); });

A lambda statement contains braces and a function body, and can potentially have multiple lines like a standard delegate. A lambda expression is the single line with an implicit return

http://www.lostechies.com/blogs/jimmy_bogard/archive/2008/07/18/expressions-and-lambdas.aspx