第1个回答 2012-05-02
I don't think these are the duty of the earth but ours.
第2个回答 2012-05-02
In my opinion, it is our duty to do so instead of the Earth.
第3个回答 2012-05-02
As far as I am concerned,it's not the earth's duty,but ours.
第4个回答 2012-05-02
In my eyes, these are our but our earth's obiligations