同学你好，该知识点来自沪江网校《零基础直达BEC商务英语高级【职场精英随学班】》的课程，想要更系统的学习，欢迎进入课程学习。不仅可以和更多的同学一起学习，而且还有老师、助教随时的学习指导和知识点解答哦。

同学好，
valley意为：谷；山谷；溪谷；流域 ，英文释义为：an area of low land between hills or mountains, often with a river flowing through it; the land that a river flows through
如：a small town set in a valley 坐落在溪谷中的小镇
峡谷的表达可用canyon表示，尤表示（周围有悬崖峭壁的）峡谷 ，英文释义为：a deep valley with steep sides of rock
从上述描述可知，山谷是凹的低地，而峡谷是更深的山谷。
关于凸起来的陆地可以称之为山丘，用hill来表达，其英文释义为：an area of land that is higher than the land around it, but not as high as a mountain
如：a region of gently rolling hills 丘陵缓缓起伏的地区
祝学习愉快~