注意数值型的字面值不包括符号(译注：正负号)，像- 1实际上是个组合了一元运算符“-”和字面值1的表达式。

Note that numeric literals do not include a sign; a phrase like -1 is actually an expression composed of the operator - and the literal 1.

youdao

注意数值型的字面值不包括符号(译注：正负号)，像- 1实际上是个组合了一元运算符“-”和字面值1的表达式。

Note that numeric literals do not include a sign; a phrase like -1 is actually an expression composed of the unary operator '-' and the literal 1.

youdao

老人不知何时已来到我的面前，一只像老松树皮一样的手颤抖着递过来一元钱！

The old man came to me, handing me a one-Yuan bill with one rough and quivering hand silently.

youdao