tied up
柯林斯词典
1. ADJ If someone or something is tied up, they are busy or being used, with the result that they are not available for anything else. 正忙著的; 正在使用的[非正式] [v-link ADJ]
He's tied up with his new book. He's working hard, you know. 他正忙他那本新書－－你要知道他現在確實很努力工作。
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