Indoor pollution, which includes sources like home heating and cooking, has remained constant over the past several decades despite advances in the area.
在过去几十年中，来源于诸如家庭供暖和烹饪等的室内污染持续存在，尽管在这方面已经有所改进。
2
This is an area where we will see constant improvement as time goes on.
随着时间的推移，我们将在这一领域看到不断的进步。
3
The pilots lost contact with air traffic controllers while flying across an area of the Atlantic Ocean known for constant bands of severe turbulence.