关于"besides"、"therefore"和"however"的区别，综合权威资料整理如下：
一、基本含义与用法
besides 含义
：表示“除了……之外还有……”，用于引出补充信息、事实或选择，强调递进关系。 - 例句
Besides studying, she enjoys painting and playing music.
The meeting started at 9 AM, besides the traffic jam.
therefore
含义：表示“因此、所以”，用于引导因果关系，说明前因后果。 - 例句 She studied hard, therefore she passed the exam. The weather was bad, therefore we canceled the picnic.however
含义：表示“然而、可是”，用于引导转折关系，表达与前面内容相反或不同的观点。 - 例句 The movie was boring, however, the popcorn was delicious. He wanted to go out, however, he had to stay home. 二、核心区别总结 | 连接词类型 | 逻辑关系 | 例句对比 | |------------|----------------|--------------------------------------------------------------------------| | besides | 递进（添加信息）| The project is difficult, besides it's time-consuming.| | therefore | 因果（结果） | The experiment failed, therefore we need to revise the hypothesis. | | however| 转折（对比） | The plan was perfect, however, unforeseen circumstances arose. | 三、易混淆点辨析 与"meanwhile"的混淆
meanwhile表示“与此同时”，强调时间上的并行关系，与"besides"的递进含义不同。例如：
The meeting started while we were preparing the report. [时间并行]
Besides the meeting, we also discussed the project. [内容递进]
注意："meanwhile"不表达转折或因果关系，需结合上下文判断是否适用。
四、使用建议
选择besides：当需要补充信息或展示递进关系时使用，如：
> Besides the main topic, we'll cover some related case studies. [补充信息]
选择therefore：当需要表达因果逻辑时使用，如：
> The data supports the hypothesis, therefore we can move forward with the experiment. [因果关系]
选择however：当需要引入转折时使用，如：
> The movie was poorly reviewed, however, it was a surprise hit at the cinema. [转折关系]
通过明确不同连接词的逻辑功能，可提升句子的连贯性和表达准确性。