首先我们来看下in addition和in addition to的大致意思：
in addition：词性为短语，除了
in addition to：词性为介词短语，除了...还有
通过下面的表格我们了解下in addition和in addition to的含义、发音和用法
接下来让我们看下in addition和in addition to的用法区别：
1.词汇形式：in addition是一个由三个单词组成的独立短语，而in addition to是一个由四个单词组成的介词短语
例子：
- I like dancing. In addition, I like singing.
(我喜欢跳舞。此外，我还喜欢唱歌。)
- In addition to studying English, he also likes playing games.
(除了学习英语，他还喜欢玩游戏。)
2.词性：in addition是一个短语，没有特定的词性，而in addition to是一个介词短语，属于介词短语的词性
例子：
- I have two things to do today. In addition, I need to go to the supermarket to buy groceries. Furthermore, I have to go to the bank to deposit money.
(我今天要做两件事。首先，去超市买菜。其次，去银行存钱。)
- We need to prepare some food. In addition to fruits, we also need some snacks.
(我们需要准备一些食物。除了水果，我们还需要一些零食。)
3.含义：in addition表示添加或附加的意思，强调连贯性；而in addition to表示除了...之外，还有...，强调并列性
例子：
- I have finished the homework. In addition, I did some extra exercises.
(我已经完成了作业，此外，我还做了一些额外的练习。)
- In addition to studying, he also participated in many extracurricular activities.
(除了学习，他还参加了许多课外活动。)
4.发音：两者的发音相同，无区别
例子：
- We need to buy some furniture. In addition, we also need to buy some decorations.
(我们需要购买一些家具。此外，我们还需要买一些装饰品。)
- In addition to milk, we also need some eggs.
(除了牛奶，我们还需要一些鸡蛋。)