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想抱孙儿的父母对我们咄咄相逼，我们需要一个组织来击败他们。
本句的主干是We need an organization...。不定式短语to help beat...grandchildless parents作目的状语。
He couldn't believe that he was beaten down by his opponent.
他无法相信自己被对手击败了。
Lisa had a persistent headache that lasted for three days.
丽萨的头连续疼了三天。
Only persistent study yields steady progress.
坚持学习，始能不断进步。
beat down还有以下含义：
表示"（太阳）直射，烤晒"。如：
At noon the sun beat down on our heads as we walked on the street.
我们中午走在大街上时正是烈日当头。
I finally beat down the price to 300 RMB.
最后我把价格砍到300元。
