1. 在…之下；在…下面
    Something that is beneath another thing is under the other thing.

    e.g. She could see the muscles of his shoulders beneath his T-shirt...
           她可以看到他T恤衫下的肩部肌肉。
    e.g. She found pleasure in sitting beneath the trees...
           她喜欢坐在树下。

2. 在…表面之下；在…的背后
    If you talk about what is beneath the surface of something, you are talking about the aspects of it which are hidden or not obvious.

    e.g. ...emotional strains beneath the surface...
           表面之下的情感纠结
    e.g. Somewhere deep beneath the surface lay a caring character...
           在内心深处的某个角落里埋藏着一颗爱心。

3. 不如；比不上；配不上
    If you say that someone or something is beneath you, you feel that they are not good enough for you or not suitable for you.

    e.g. They decided she was marrying beneath her...
           他们认定她要嫁给一个配不上她的人。
    e.g. Many find themselves having to take jobs far beneath them.
           很多人觉得自己在工作上被迫大材小用。