您要查找的是不是：
- PSA灰區grey zone
- 區district
- 灰區gray area
- 診斷灰區Diagnoses Gray Zone
- 灰區措施grey area measure
- 太陽(yáng)黑子周?chē)^濃的淺灰區The grayish outer part of a sunspot.
- 區號district number
- 廠(chǎng)區factory; mill; plant; works
- 大區pergana
- 不費吹灰之力as easy as blowing off dust - not needing the slightest effort
- 明區hyalomere
- 吹灰之力just little effort
- 吹灰器sootblower
- 保存工作區save workspace
- 清灰soot cleaning
- 中區median space
- 灰黑greyish black
- 扇區sectors
- 泥灰巖marlite
- 病區infected patch
