位移函数中应有四个未定常数。

These should be four undetermined constants in the displacement function.

youdao

这就意味着在到达常数声明语句前局部常数值是未定义的，在函数中分配变量前局部变量是未定义的。

This means that the value of a local constant is undefined until the constant declaration statement is reached and that a local variable is undefined until the variable is assigned to in the function.

youdao