Did you mean: yanshan yanguan yanjuan yanquan yansun yunsuan yanjian yangyan ?
| 盐酸 | yán suān | hydrochloric acid HCl |
| 验算 | yàn suàn | to verify a calculation / a double-check |
| 演算 | yǎn suàn | to perform calculations |
| 烟酸 | yān suān | niacin (vitamin B3) / 3-Pyridinecarboxylic acid C6H5NO2 / nicotinic acid |