我认为这是个好主意,首先是因为它能节省时间,其次是因为它更便宜。

I think it's a good idea, firstly because it saves time, and secondly because it's cheaper.

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I think it's a good idea, firstly because it saves time, and secondly because it's cheaper.

firstly 是副词,由 first(第一)加上后缀 -ly 构成,表示"首先、第一点",用于列举理由或观点时的顺序标记。

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