1.Sifting is important for soft, fluffy, and airy biscuits.

想要做出松软、蓬松、有气孔的酥饼，用筛子筛筛是很重要的。

2.We must sit without light. He would see it through the ventilator. I nodded again.

我们必须摸黑坐着，他会从通气孔发现有亮光的。我又头。

3.It's got this tiny air hole that lets the steam out and stops it from creating a vacuum.

它有微小的气孔，可以让蒸汽排出并阻止它产生真空。机翻

4.Then the kinda-liquid-kinda-gas can drift out of the solid molecular structure, and be replaced by air, so you have a porous, lightweight material that retains its shape.

然后，这种似液体又似气体的物质可以从坚固的分子结构中漂移出来，被空气所取代，这样你便得到有气孔的还保持原始形状的极轻材料。

5.They have a system of external openings called spiracles, that lead to a branching network of tubes called tracheae, that diffuse oxygen through their bodies.

它们有称为气孔的外部开口系统，通向称为气管的分支网络，通过它们的身体扩散氧气。机翻