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• The river broadens out at its mouth. 河面在河口处变宽。
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• broaden one's horizons 开阔某人的视野 -
• broaden one's mind 使某人心胸开阔
用法说明
broaden, widen都可作“变宽”、“扩大”解。但broaden侧重在原有基础上，将两条边界再向外推出，使面积更为广阔；而widen则强调在两条界限的外面再“扩大”，使宽度增大。
试比较：
The city government plans to broaden the road into a four-lane highway. 市政府计划将这条路加宽为四个车道的公路。
The city government plans to widen the highway by adding two lanes.工人们正在给这条公路扩建两个车道。