One of the things often have a dual nature.
一件事物的产生往往有两面性。
The design of human nature, a dual-use, whim.
人性化的设计，一款两用，随心所欲。
Anything has its dual nature and human behavior is a double-edged sword.
任何事物都具有双重性，人类的行为也是一把双刃剑。
Anything has its dual nature and human behavior is a double-edged sword.
任何事物都具有双重性，人类的行为也是一把双刃剑。
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