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| 1. | If we sprinkle some powder into water and then study it under a microscope, we shall see the particle |
| 如果我们将一些粉末撒到水中，然后在显微镜下加以观察，我们就会看见粉末的粒子被水分子推来推去，如果将水加热，那么粒子运动就快些。 |
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| 2. | Punch down and sprinkle baking powder evenly on surface and knead until combined. |
| 面团放在案台上，用手排挤出气体。 |
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