立体膨胀花是一种看起来非常有趣的物品，它们在干燥的状态下小巧可爱，但一旦放入水中，我们期望它们能够膨胀变大。然而，事实却往往出乎我们的意料，立体膨胀花并没有膨胀，而是保持原来的大小。那么，为什么立体膨胀花泡在水里不会膨胀呢？

首先，我们需要了解立体膨胀花的构造。它们由一种叫做聚合物的材料制成，这些聚合物可以吸收水分。当我们将立体膨胀花放入水中时，水分确实会通过聚合物渗透到内部。然而，与我们期望的不同，它们并没有膨胀。

这个现象可以归因于内部结构的特殊设计。立体膨胀花的内部构造类似于一个海绵状的网络，它包含许多微小的孔洞和通道。这种特殊结构使得水分可以渗透进入花朵内部，但也会立即被吸附住。当水分被吸附后，聚合物就处于饱和状态，无法再吸收更多的水分。因此，立体膨胀花在水中并不会膨胀。

除了内部结构的设计之外，聚合物材料的性质也影响着立体膨胀花的膨胀能力。一些聚合物具有极好的吸水性能，可以吸收大量的水分并迅速膨胀。然而，立体膨胀花所使用的聚合物通常是经过处理的，以便控制吸水速度和膨胀程度。这样做的目的是使立体膨胀花在水中能够保持稳定的形状，而不是迅速变得笨重或失去原有的外观。

虽然立体膨胀花在水中不会膨胀，但它们却有着其他的魅力。首先，它们可以作为装饰品使用，为房间或办公室增添一份生机和趣味性。其次，立体膨胀花在干燥环境下可以长时间保存，并且可以反复使用。只需将它们取出水中并晾干，它们就会恢复到原来的形状和大小。

在科学实验教育中，立体膨胀花也常被用作教学材料。通过观察和研究它们的特性，可以帮助学生了解不同材料的吸水性能以及内部结构对物体性质的影响。

总之，立体膨胀花泡在水里不膨胀的原因是由于其特殊的内部结构和聚合物材料的特性。虽然我们可能感到失望，但立体膨胀花仍然具有独特的吸引力和应用领域，无论是作为装饰品还是科学教育工具。

英文翻译对照：

Why does the expanding flower not expand when soaked in water?

The expanding flower is an intriguing object that appears small and cute in its dried state. However, when submerged in water, we expect it to expand and grow larger. Surprisingly, the expanding flower does not inflate as anticipated but remains the same size. So why doesn't the expanding flower expand when soaked in water?

Firstly, we need to understand the structure of the expanding flower. It is made of a material called polymer, which has the ability to absorb water. When we place the expanding flower in water, the water does indeed penetrate the polymer and enter the interior of the flower. However, contrary to our expectations, it does not expand.

This phenomenon can be attributed to the unique design of the internal structure. The internal structure of the expanding flower resembles a sponge-like network with numerous tiny pores and channels. This special structure allows water to penetrate the flower but quickly gets absorbed. Once the water is absorbed, the polymer becomes saturated and cannot absorb any more water. As a result, the expanding flower does not inflate when submerged in water.

Aside from the design of the internal structure, the properties of the polymer material also influence the expanding capability of the flower. Some polymers have excellent water absorption properties, allowing them to absorb a large amount of water and expand rapidly. However, the polymer used in the expanding flower is typically processed to control the rate of water absorption and degree of expansion. This is done to maintain a stable shape in water, rather than becoming excessively heavy or losing its original appearance.

Although the expanding flower does not expand in water, it still possesses other charms. Firstly, it can be used as a decorative item, adding vibrancy and whimsy to a room or office. Secondly, the expanding flower can be stored for extended periods in dry environments and reused. Simply removing it from water and allowing it to air dry will restore it to its original shape and size.

In science education, the expanding flower is often employed as a teaching material. By observing and studying its characteristics, students can gain insight into the water absorption abilities of different materials and the influence of internal structures on object properties.

In conclusion, the expanding flower does not expand when soaked in water due to its unique internal structure and the properties of the polymer material. Although it may be disappointing, the expanding flower still possesses distinctive appeal and various applications, whether as a decorative piece or a tool in scientific education.