The artist created an installation by reappropriating discarded plastic bottles to convey an environmental message.

reappropriating 是动词 reappropriate 的现在分词形式。reappropriate 由前缀 re-（表示"重新"）和动词 appropriate（挪用、占用）组成，字面意思是"重新挪用"。在艺术语境中，指将废弃物品重新赋予新的艺术价值和意义。