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first 和 firstly 的用法区别是什么？ - 知乎 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 would like to thank everyone who has contributed to this success
the first to do为什么要用to do？ - 知乎 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 to arrive 和He is the first (= very willing) to admit that much of his success is due to his good looks
First-in-Class、首创药物、原创新药、原研药，是什么关系？ - 知乎 “First in Class”，顾名思义，也就是首创新药。 根据FDA定义，被授予First-in-class的药物是指使用全新的、独特的作用机制来治疗某种疾病的药物。 它是一种彻底创新的方法，第一个能够治疗该疾病的药。 在NMPA的申报当中，它同样也应该属于1 1类新药。
At the first time和for the first time 的区别是什么？ - 知乎 At the first time：它是一个介词短语，在句子中常作时间状语，用来指在某个特定的时间点第一次发生的事情。 例如，“At the first time I met you, my heart told me that you are the one ”（第一次见到你的时候，我的心就告诉我，你就是那个人。