The lesson we learn from the big fire is that we should be more and more careful.我们从这场大火记取的教训是我们应该越来越注意用火.(learn from的意思是“向.学习；从.中学会”)
He lay under a tree,staring into the sky.
他躺在树下,（眼睛）盯着天空.（lie的过去式是lay）