coarsens the texture 使质地变粗糙
coarsens the surface 使表面变粗糙
coarsens the sound 使声音变粗
coarsen over time 随时间变粗糙
coarsen gradually 逐渐变粗糙
1. The rough weather coarsens the surface of the wood.
恶劣天气使木材表面变得粗糙。
2. The material coarsens when it is exposed to heat for a long time.
这种材料长时间受热后会变粗糙。
3. His voice coarsens as he gets older.
随着年龄增长，他的声音变得更加粗沉。
A: Why does the surface look different now?
A：为什么表面现在看起来不一样了？
B: The weather coarsens the material over time.
B：天气会随着时间使这种材料变粗糙。
1) 表示使质地或表面变粗糙。
2) 表示使声音、风格等变得不精细。
3) 是coarsen的第三人称单数形式。
1. 使变粗糙；使变粗劣。
e.g. The dry air coarsens the skin.
干燥空气会使皮肤变粗糙。
2. 使声音、行为或表达方式变得粗俗或不细腻。
e.g. The experience coarsens his attitude toward others.
这段经历使他的态度变得不够温和。
verb
1. To make something rougher, less fine, or less delicate.
2. To become or make something less refined in quality or manner.
Synonym: roughens, hardens, worsens