英文文法問題20點☆

1. One desperately-needed application would be that of water purification.

請問上句為何會用be that of 這是什麼文法?

2. the same...as / the same...with / the same...that 有什麼差別?

3. Nanomachines introduced to polluted water could kill harmfl bacteria.

請問上句為何會有兩個動詞 那個to又是什麼 這是什麼文法?
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