确保油漆在整个墙面上涂抹均匀。

Make sure the paint is applied at an even ___level across the entire wall.

科学家们担心不断上升的海平面及其对沿海城市的影响。

Scientists are concerned about the rising sea ___level and its impact on coastal cities.

定期检查你车里的机油液位，以确保发动机平稳运行。

Check the oil ___level in your car regularly to ensure the engine runs smoothly.