showed:
v. 显示；表现；展示（show的过去式）
He showed courage in adversity.
他在逆境中显示出了勇气。
shown:
v. 解释（show的过去分词）；给予；表露
What have their researches shown?
他们的研究证明了什么？
What have their researches shown?
他们的研究证明了什么？
You have shown great strength of character.
你表现得很有毅力。
He has shown himself to be a caring father.
他向人们证明自己是个有爱心的父亲。
She had shown herself unable to deal with money.
她所做的事已表明她不善理财。
