hair thinning 头发变稀疏
paint thinner 稀释剂
forest thinning 林分密度降低
thinning out 逐渐变稀疏
A: Have you noticed any hair thinning lately?
A：你最近有没有注意到头发变稀疏？
B: Yes, I think it's due to stress.
B：是的，我觉得是因为压力太大了。
1) 变薄，变稀疏
2) 稀释
3) 减少密度
1. 变薄，稀释
noun
1. the process of becoming less thick, dense, or numerous