observational例句
The
observational work is carried out on a range of telescopes.
观测工作借助于各种望远镜。
We have experimental and
observational evidence concerning things which happened before and after the origin of life.
有关生命起源前后发生了什么，我们通过实验和观察得出了一些证据。
The
observational data were irrefutable.
这些观测资料是不容怀疑的.