The exact quantity cannot be determined at present.
确切数量目前尚不能确定。
However, for some use cases, the entities to be selected can only be determined at run time.
不过,在某些情况下,选择的实体仅能够在运行时决定。
Most languages with default argument values only allow constants or other values that can be determined at parse-time.
大多数支持默认参数的语言只允许编译时能决定的常量或者值作为默认值。
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