The students also shared thoughts and strategies about how to overcome the sometimes subtle, sometimes overt barriers to success for blacks.

Discrimination and subtle barriers still count as a factor for preventing women from exploring opportunities.

Non-neoclassical economists point out subtle barriers play a huge role in women's disadvantage.

China has created many more subtle barriers as well, Mr. Aaron said, such as increasingly cumbersome regulations on foreign currency transactions.

Are these entrances to gardens, perhaps, or do the plants act as subtle barriers to passage?

But they appear to ignore two basic questions about integration: On what terms should it happen, and how can it occur when subtle barriers are constantly erected?

The glass walls provide a subtle, sound-deadening barrier between the bookers and strangers.

Ms. Linde has hung white voile on all four walls of the room, providing a subtle pleated barrier between it and the busy sidewalk outside.

The change is easy to understand: no longer protected by heavy tariffs or America's unchallenged technological dominance, domestic producers have looked for subtler barriers to imports.

Dr. Walker experienced the subtle and not-so-subtle barriers he later fought on behalf of younger colleagues and students.