translation

hi guys, i`m helping a friend to translate some stuff, however, i don`t know some of its chinese translation, can anyone help?

1. la nina- you know, as in "cold episodes"..
2. affirmative action- the set of public policies and initiatives designed to help eliminate past and present discrimination.
3. glass ceiling- a ceiling based on attitudinal or organizational bias in the work force that prevents minorities and women from advancing to leadership positions

uh, i only need to translation for the nouns, the definitions are for your references~ anyone know what i`m talking about?