There is an open space with a length of 45 meters and a width of 25 meters in the park. If 4 plants are planted per square meter of open space, how many plants can be planted in total?
公园里有一块长45米，宽25米的空地，如果每平方米空地上种植4棵植物，共可种植物多少棵？
<result>450</result>