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1. A medical expert testified that George Floyd died because he couldn't breathe in enough oxygen while he was pinned down.
pin down 发现；使...受约束
We were pinned down by enemy fire.
敌方火力使我们无法移动。
2. Officials in Northern Ireland are calling for calm after Catholic and Protestant youths battled police and each other.
call for 要求；提倡；呼吁
He didn't even have the intelligence to call for an ambulance.
他连呼叫救护车的头脑都没有。
