那位黑带大师正在教孩子们空手道的基本动作。

The ___black-belt master is teaching the kids basic karate moves.

她花了五年时间才获得这条黑带。

She spent five years earning this ___black-belt.

作为营销界的黑带高手，他总能想出创新的推广方案。

As a ___black-belt in marketing, he always comes up with innovative promotion strategies.