句子 + the first time + 句子 Jack was only 18 the first time he met his first love. The first time he solved that problem, he felt extremely happy. 可以看出此用法后面都接了一个完整的句子，作主句的时间状 … From bing.com
first 有多种词性，其中就有名词，剑桥词典对作名词的first的定义是：the first person or thing to do or be something, or the first person or thing mentioned，例句有： [ + to infinitive ] She was one of the first … From bing.com
first和firstly作副词时完全同义，都可以表示“第一，首先”，都可用作句子副词，此时first也可写作first of all。 例如： First，I would like to thank everyone for coming. 首先，我要感谢各位光临。 Firstly，I … From bing.com
IS GREEK AND LATIN EASY TO LEARN? WHICH SHOULD I LEARN FIRST ... - 知乎
For classical language learners with only English proficiency, both Greek and Latin are merely semi-comfort zones, so I would say it doesn't matter which one to learn first. However, personally, I would … From bing.com
以下是一些例句： The first step is to gather your materials. Firstly, let's discuss the budget. First of all, we need to identify the problem. 在大多数情况下，"first" 和 "firstly" 可以互换使用，但 "firstly" 通常用 … From bing.com
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