用It’s a good idea to do sth翻译明天去野餐是个好主意.为他开个生日聚会是个好主意.

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用It’s a good idea to do sth翻译明天去野餐是个好主意.为他开个生日聚会是个好主意.

It's a good idea to have a birthday party for him.

It’s a good idea to have a picnic tomorrow.
It’s a good idea to make a birtjday party for him.