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

想要做出松软、蓬松、有气饼，用筛子筛一筛是很重要。

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

我们必须摸黑坐着，他会从通气发现有亮光。我又点了点头。

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

它有一个微小气，可以让蒸汽排出并阻止它产生真空。

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物质可以从坚固分子漂移出来，被空气所取代，这样你便得到有气还保持原始形状极轻材料。

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.

它们有一个称为气外部开口系统，通向一个称为气管分支网络，通过它们身体扩散氧气。