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常量_Solidity基础教程_哔哩哔哩_bilibili
来自：www.bilibili.com/video/BV1FV4y1e7Bd/?vd_source=5cc7a3e0edb202d771d9b39d03f42ef5&share_medium=web&share_source=baidu&bbid=6DF92030-1BED-0312-1751-659F5D0F53A741233infoc&ts=1692239263585