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重点讲解：
1. insert into 插入；嵌入；
例句：He took a small key from his pocket and slowly inserted it into the lock.
他从口袋里掏出一把小钥匙,慢慢地插到锁眼里。
2. for example 例如；比如；
例句：For example, a research paper could be made into a video but would not be as easy to follow as the text.
比如，一份研究论文可以制作成视频，但不如文本易于理解。
3. at least 至少；起码；
例句：At least this second meeting had helped to thaw the atmosphere.
这第二次会议至少起到了缓和气氛的作用。
n. （单复同）物种，种类
