have a picnic为神马要用have?

have a picnic为神马要用have? 词组：have a picnic to have a picnic have a picnic have a picnic是什么意思 have a picnic音标 关于have a picnic have a picnic的意思. Let's have a picnic have a picnic英语作文 have a picnic的音标 have a picnic 中文意思