通过词典的具体说明、例句的对比，可以看到at first有以下同义（近义）词语：
to begin with, to start with, at/in the beginning, initially, originally。
《韦氏高阶英汉双解词典》第178页begin词条
to begin with
1首先；第一
2起初；原先；开始的时候
She didn’t like her job to begin with (= at first, initially), but she got used to it eventually.
刚开始她并不喜欢自己的工作，但最后就适应了。
《牛津高阶英汉双解词典》第八版第167页beginning词条
at the beginning (of)指开始的时间和起点。
in the beginning等于at first，与后来相对。
《牛津高阶英汉双解词典》第八版第166页begin词条
to begin with: at first起初；开始
I found it tiring to begin with but I soon got used to it.
我起初觉得很累，但不久便适应了。
We’ll go slowly to begin with. 我们开始时会慢慢来的。
《文馨当代英汉词典》第969页initially词条
initially adv. 在最初，在开始（= at first）
Initially, she was not interested. 开始时，她不感兴趣。
I don’t remember who initially said that. 我不记得谁最先说了那句话。
《牛津高阶英汉双解词典》第八版第1452页originally词条
originally原来；起初
Originally, we had intended to go to Italy, but then we won the trip to Greece.
我们本来打算去意大利，但后来赢得机会去了希腊。
《朗文当代高级英语辞典》第五版第1780页originally词条
originally原先；最初
Originally, we had planned a tour of Scotland but we didn’t go in the end.
起先我们计划到苏格兰旅游，但最后没有成行。
《朗文当代英语大辞典》（新版）第679页firstly词条
at first只可用于表示一段时间，常与稍后的一段时间作比较，to start/begin with和in the beginning也可以这样用：
You’ll find it difficult at first/ to begin with, but later/soon it’ll get easier.
起初/开始你会觉得很难，但后来/很快就会感到容易起来。
《英汉多功能学习词典》第583页first词条
at first最初，起初（通常含有“后来便不是这样了”之意，后面一般接but从句、then、later等。注意与for the first time初次的区别）
He succeeded at first, but he failed in the long run.
他先是取得了成功，最后却失败了。
《剑桥美国英语词典英汉双解版》第881页originally词条
It was a bedroom originally (= in the beginning), but we turned it into a study.
这间房原来是卧室，但是我们把它改成了书房。
They now live in California, but originally they came from Mexico.
他们现在住在加利福尼亚，但原籍是墨西哥。
《朗文英语写作活用词典》第146页at first/initially词条
at first/initially起先，起初（initially比at first正式）
Barney was quiet at first, but gradually he became more confident.
起先巴尼不声不响的，但后来逐渐变得自信起来。
They offered her the job, initially on a temporary basis but later as a full member of the staff.
起初他们聘请她做临时工，但后来就把她转为正式员工了。
《文馨当代英汉词典》第168页beginning词条
at/in the beginning起初，最初
You will find it difficult in the beginning, but you will soon get accustomed to it.
开始你会觉得困难，但不久就会习惯的。
《朗文英语写作活用词典》第146页at the beginning/start词条
at the beginning/start在开始时
At the start it looked as though Italy would win but Argentina improved as the game went on.
起先似乎是意大利队会赢，但随着比赛的进行，阿根廷队越踢越好。
She was nervous at the beginning but she settled down as she got further into her speech.
演说刚开始时她很紧张，但讲着讲着她就安定下来了。
2017年10月30日
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