Because Ruby is a dynamically typed language, it doesn't require interfaces.
因为Ruby是动态类型语言,所以它不需要接口。
As a dynamically typed language, Ruby has great flexibility, convenience, and power, but at a cost.
做为动态类型语言,Ruby有很强的灵活性、方便性和功能性,但这些优点是有代价的。
Scheme is a dynamically typed language; therefore, the type of a variable is not generally known until run time.
Scheme 是一种动态类型语言;因此,变量的类型通常只有到了运行时才知道。
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