integral of time multiplied by squared error criterion

例句：

1. 1.The problem is that the integral of time multiplied by squared error criterion is not a well-defined function.
   问题在于，时间积分乘以平方误差准则不是一个定义良好的函数。
2. 2. The integral of the function f(x) over the interval [a, b] is denoted as F[a, b].
   函数f(x)在区间[a, b]上的积分表示为F[a, b]。
3. 3. The integral of the function g(x) over the interval [a, b] is denoted as G[a, b].
   函数g(x)在区间[a, b]上的积分表示为G[a, b]。