1. 层
    A layer of a material or substance is a quantity or piece of it that covers a surface or that is between two other things.

    e.g. A fresh layer of snow covered the street...
           街上覆盖了一层新雪。
    e.g. ...the depletion of the ozone layer...
           臭氧层的损耗

2. 层次；阶层；等级
    If something such as a system or an idea has many layers, it has many different levels or parts.

    e.g. ...an astounding ten layers of staff between the factory worker and the chief executive...
           工厂工人和首席执行官之间10个等级的巨大差距
    e.g. Critics and the public puzzle out the layers of meaning in his photos.
           评论界和公众揭开了他照片中的重重深意。

3. 分层放置
    If you layer something, you arrange it in layers.

layer什么意思

    e.g. Layer the potatoes, asparagus and salmon in the tin...
           把土豆、芦笋和大麻哈鱼分层装入罐头内。
    e.g. By lifting and layering her hair, Michael created a lighter frame for her face.
           通过把头发往上梳，增加层次感，迈克尔让她的脸型显得更为柔和。