level and smooth

例句：

1. 1. The road is level enoughfor cars to drive on.
   这条道路足够平坦，可以供汽车行驶。
2. 2. The studentsare at different levels of understanding the material.
   学生们对材料的理解程度各不相同。
3. 3. The companyhas a level of success that few otherscan match.
   这家公司的成功程度是很少有公司能匹敌的。
4. 1. The surfaceof the glass is smooth and reflects lightbeautifully.
   玻璃的表面光滑，光线反射得非常好。
5. 2. The car's engine is smoothand quiet.
   这辆车的引擎运行平稳且噪音小。
6. 3. The new paint job makesthe room look much smoother.
   新的油漆工作让房间看起来更加光滑。