当出现 "expression cannot be as a function" 的错误时，通常是因为您在程序中尝试将一个非函数的变量作为函数来调用。可能是您误将变量名作为函数名，或者将函数名拼写错误，导致编译器无法识别您的代码。以下是一些可能导致这个错误的常见情况：在函数调用时，将变量名误写为函数名：函数名拼写错误：...
that is finished, it cannot be changed. The expression comes from the idea that water has flowed over a dam, cannot be brought back again. When a friend is troubled by a mistake she has made. You might tell her to forget about it. You say "I :“水在水坝”是另一个表示关于a通过...