A system model for evaluation of BF life is created so as to determine each factor influencing the BF life and the temperature limit in hot surface of the cooler.

为探讨高炉长寿问题，建立了一套高炉寿命评价系统模型，以确定影响高炉长寿的各种因素及冷却器热面极限温度值。

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For this reason, the speed of a grinding wheel should not exceed the safe surface speed limit specified by the manufacturer.

基于此原因，砂轮的速度不应超过制造商规定的安全表面速度的限制。

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This pattern can provide an additional layer of security, and limit the attack surface of the system.

这种模式可以提供一个额外的安全层，并限制了对系统的攻击。

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On the surface, the clues strongly imply that Voyager 1 has passed the limit of our solar system's influence.

ENGADGET: AGU study says Voyager 1 has reached interstellar space, but NASA remains skeptical

There is a limit to the lifetime of these features: Europa's surface is relatively young, having been resurfaced by currently unknown processes some 50 million years ago.

BBC: Ice blades threaten Europa landing

And a 50mph speed limit is in place on much of the M4 in south Wales due to surface spray.

BBC: Flooding: Heavy rain could spark more floods, agency warns