这家公司的员工分为四个等级。

The company divides its employees into four ___tiers.

这家酒店根据服务质量分为三个等级。

This hotel is divided into three ___tiers based on service quality.

这个蛋糕有三层，每一层都有不同的口味。

This cake has three ___tiers, each with a different flavor.