世界野生生物资金会相信，也许北极熊的养殖能力开始受到影响，是因为越来越多的母北极熊达到他们能再生产的最低重量。
The World Wildlife Fund believes it may also start affecting their ability to breed as more and more female polar bears are getting close to the minimum weight at which they can reproduce.
爬升限重，取决于由一台发动机工作时的最低爬升梯度的最大起飞重量。
Climb LIMIT weight, Maximum takeoff weight based on a minimum climb gradient with one engine inoperative.
板面粗糙度不能超过40微寸(1.0微米)，以达到最低镀层重量。
Strip roughness must not exceed 40 microinch (1.0 micron) in order to achieve these minimum coat weights.
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