解释一下此句子结构What he wrote is more of a poem than a letter.这里of什

解释一下此句子结构What he wrote is more of a poem than a letter.这里of什 he is more of a friend than a teacher.这里的of能不能省略? He wrote a letter of ________ (invite) to his friends. he is more of a talker than a doer he is no more than a boy of twelve. we wrote a letter of thanks to--had helped us 解释一下为什么填whoeve 英译汉“You are more of a risk to him than he is to you"和“What a What letter is a body of water? “What letter is a part of body? What letter is a kind of vegetable? What letter is a party of what letter is a part of body?