N. officials say relief and rescue efforts have been hampered by poor weather conditions, with helicopters in the northwestern Swat Valley grounded on Friday.
在西北部斯瓦特山谷进行救援的直升机星期五被迫停飞。
A 35 lb (156 N) force was applied for a period of 1 min to the supply cord at the strain relief in a direction to cause the greatest movement of the cord.
用35英镑（156牛顿）的同方向拉力作用于出气冒口的电源线，维持一分钟，从而使电源线的移动行程最大。
A 35 lb (156 N) force was applied for a period of 1 min to the supply cord at the strain relief in a direction to cause the greatest movement of the cord.
用35英镑（156牛顿）的同方向拉力作用于出气冒口的电源线，维持一分钟，从而使电源线的移动行程最大。
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