vaccine, a substance which contains a form of a bacteria or virus, which is injected into a person to prevent them from developing an illness or disease, pneumatic, containing air, suspension bridge, a bridge which is supported at each end by strong metal ropes which are connected to towers, circuit, a circular shaped sports track, supersonic, faster than the speed of sound, sustainable, able to continue over a period of time because little or no damage is caused to the environment, shrink, to make something smaller in size, ubiquitous, seeming to be everywhere, replicate, copy or make something exactly like another thing.

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