At least a nodding acquaintance with physics was essential.
至少懂一点物理学还是必要的。
Again, he is a nodding acquaintance, I don't even know his name.
他是点头之交，我连他的名字都不知道。
Nor until yesterday's cocktail party did I make a nodding acquaintance with Mr. And Mrs. Black.
直到昨天的鸡尾酒会上，我才和布莱克夫妇有了点头之交。
Nor until yesterday's cocktail party did I make a nodding acquaintance with Mr. And Mrs. Black.
直到昨天的鸡尾酒会上，我才和布莱克夫妇有了点头之交。
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