| 1 | You now have a dropper fly set up. | |
| 2 | Squeeze the rubber bulb and insert the dropper into the bottle. | |
| 3 | When a second, or third, fly is used, it is called a dropper fly . | |
| 4 | Select the gray point eye dropper tool and click on the white area of the eye. | |
| 5 | And introduce the conception of the dropper function and deduction of math expression. |