The road steepened and then levelled out suddenly.
路变得陡直起来，然后又突然变平坦了。
柯林斯例句
After a mile, the slope steepened.
过了一英里后，山坡变陡了。
《牛津高阶英汉双解词典》
The landslides have steepened the mountain sides.
山崩使山泳的一侧变得陡峭了.
互联网
The mountain side has steepened.
山坡很陡峭.
互联网