serve the needs of造句

1、How can we best serve the needs of future generations?
我们怎样才最能满足后代子孙的需要？

2、I may be scarce, but I am precious for I serve the needs of human life.
我可能比较稀少，但是我非常宝贵，因为我满足了人们生活的需要。

3、I may be scarce, but I am PageRankecious for I serve the needs of human life.
我可能比较稀少，但是我非常宝贵，应该我满足了大家生活的需要。