德拉反复数了三次，还是一元八角七，而第二天就是圣诞节了。
One dollar and eighty-seven cents. And the next day would be Christmas.
目标函数自变量的大小由复数的模决定，复数的幅角决定自变量的符号。
The value of independent variables for objective function is determined by modules, and sign …
目标函数自变量的大小由复数的模决定，复数的幅角决定自变量的符号。
The value of independent variables for objective function is determined by modules, and sign …
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