I don't know 也不仅仅只有我不知道这个意思，有时候在语境里面还表示我也说不准，我也不确定，间接表示容我想想。
lie about: 就…撒谎；
"The movie sucked. I didn't lie about that." （电影烂透了，我可没瞎说----美剧《新飞跃比弗利》
pitch: The pitch of a sound is how high or low it is. 音调
He raised his voice to an even higher pitch. 他将嗓门提得更高了。----柯林斯字典
That's all for today
August 20, 2018. XOXO
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