虚心请教

先生能否为我分析一下你翻译的第一句：

At a wall corner some plum trees grow,
Alone against cold white blossoms blow.
Aloof one knows they aren't the snow,
As faint through air soft fragrances flow.

第一句的四个feet是怎分的，那几个是一个 foot，那些是stress音，那些是unstress音。那些（个）是  extra non-stressed.

多谢。