at the beginning of 意思是:在……开始的时候,在……初
at the beginning of 是习惯表达,beginning是名词, 而begin是动词,意为:开始,开端
例:Remember how you set up three databases at the beginning of this exercise?还记得在本练习开始时如何设置三个数据库的情况吗?
例:At the beginning of their marriage he really tried to be there for me. 他们结婚初期,他的确尽力在我需要的时候陪伴着我。
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