the superior limit

Two mathematic methods are presented to prove that 2-parameter hyperbolic model and exponential model are the superior limit and lower limit of the corresponding new 3-parameter model respectively.

采用2种方法证明了初始导数、极限值对应相等的情况下，指数曲线模型、2参数双曲线模型分别是3参数模型的上界、下界；

It is meanwhile good practice to limit performance metrics to as few as possible, and the carbon footprint does not belong on the list when far superior techniques are available.

与此同时把性能指标限值限制得尽可能小也是很好的举措，并且当高科技有效的时候，碳排放量并不在列单上。

If the diesel engine has a superior economic performance, a dependable work, and if the noise and the vibration can be controlled in a lower limit, which usually depends upon its valve train system.

一台柴油机的经济性能是否优越，工作是否可靠，噪音与振动能否控制在较低的限度，常常与其配气机构的设计是否合理有密切关系。