主要原因之一是栖息地的丧失。

One of the main reasons is loss of habitat.

主要原因之一是人们想挑战自己。

One of the main reasons is that people want to challenge themselves.

说善意的谎言的主要原因之一是让别人感觉好些。

One of the main reasons for telling a white lie is to try to make others feel better.

吸烟是导致肺癌的主要原因之一。

Smoking is one of the main causes of lung cancer.

吸烟是导致肺气肿的主要原因之一。

Smoking is one of the main causes of emphysema.

工业污染是环境恶化的主要原因之一。

Industrial pollution is one of the main causes of environmental degradation.

人为因素是导致错误的主要原因之一。

The human factor is one of the main causes of errors.

温室效应是气候变化的主要原因之一。

The greenhouse effect is one of the main causes of climate change.

工业污染是全球变暖的主要原因之一。

Industrial pollution is one of the main causes of global warming.

工厂排放的废水是水污染的主要原因之一。

Wastewater discharged from factories is one of the main causes of water pollution.