这份说明书的简洁性让操作变得非常简单。

The ___simplicity of the manual makes the operation very easy.

她喜欢房间里简单的装饰，没有任何多余的摆设。

She prefers the ___simplicity of her room's decoration with no extra clutter.

他设计的这款家具以其简洁自然的风格受到欢迎。

The furniture he designed is popular for its ___simplicity and natural style.