不同地区的生活成本存在明显差异。

There are noticeable ___differences in living costs across different regions.

转弯时，差速器能让左右轮以不同速度转动。

The ___differential allows the wheels to rotate at different speeds when turning.

工资差异通常反映了员工的经验和技能水平之间的差别。

Salary ___differentials usually reflect the differences in employees' experience and skill levels.