市场上缺少一家好的鱼店，这是个商机。

There's ___a ___gap ___in ___the ___market for a good fish shop.

他们的初创公司通过识别并填补了环保包装市场的空白而取得了成功。

Their startup succeeded by identifying and filling ___a ___gap ___in ___the ___market for eco-friendly packaging.

这份报告强调，市场上缺乏为老年用户设计的平价智能家居设备。

The report highlights ___a ___gap ___in ___the ___market for affordable smart home devices for elderly users.