The air was soon filled with tiny balloons, each balloon carrying a spider.

空中很快飞满了小气球，每个小气球带走一只小蜘蛛。

Each of these tiny balloons is surrounded by a mesh of blood-filled capillaries.

每个这样的小球都被充满血液的网状毛细血管包围着。

A vesicle is a little ball, like a tiny little balloon.

囊泡是个小球，像个小小的气球。

When you breathe in, all these tiny balloons fill up with fresh air.

吸气时，所有这些小气球都会充满新鲜空气。

A vesicle is a little ball, like a tiny little balloon.

Rothman：囊泡是一个小球，就像一个小气球。