二维数组定义
1
uint[2][3] grade = [[60,80],[40,20],[50,50]]; uint[2][3] grade = [[60,80],[40,20],[50,
uint[2][3] grade = [[60,80],[40,20],[50,50]]; uint[2][3] grade = [[60,80],[40,20],[50,
阅读背景：
solidity智能合约[18]-twoarray
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