字面意思都能看懂，但是词性和结构上混乱，手头是目前只有这两个例句

1.as someone who has seen more than her fair share of bad beef.字幕翻译：作为一位阅尽天下极品男的人。

2.global warming is causing more than 300,000 deaths and about 125 billion in economic losses each year .

3.in less than an hour,this place will be under water.

1和2的more than咋理解？more是代词还是副词，than是介词吗？还是不应该拆开去理解，要整体去看待?对于more than总是搞不明白。

3中less than咋分析成分？