A nice analogy is to imagine that the Universe are three-dimensional spaces like the surface of a rubber balloon that I'm blowing up.
一个恰当的比喻是想象宇宙是在三围的空间，就像我正在吹起的橡皮球。
Rubber balloon
原声例句
美国历史频道纪录片《宇宙》
TED演讲（视频版） 2019年4月合集
Moving towards more complex designs of HASEL for bio-inspired robotics, here you see our artificial scorpion that can use its tail to hunt prey, in this case, a rubber balloon.
转向更复杂的 HASEL 仿生机器人设计，在这里你可以看到我们的人造蝎子可以用它的尾巴捕食猎物， 在这种情况下， 是一个橡胶气球。
英语百科
Toy balloon
A toy balloon or party balloon, is a small balloon mostly used for decoration, advertising and child toy. Toy balloons are usually made of rubber or aluminized plastic, and inflated with air or helium. They come in a great variety of sizes and shapes, but are most commonly 10 to 30 centimetres in diameter. Toy balloons are not considered to include "sky lanterns" (hot-air paper balloons), although these too are or were used as child toys in some parts of the world.
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