当梯子下耑离墙7英呎时梯子上耑下降的瞬时速度是？
At what rate is the top of the ladder descending at the instant when the lower end is 7ft. away from the wall?
他放暸个25英呎的梯子在茱丽叶房间墙壁外面然后开始爬。
He places a 25 ft. (feet) ladder against the wall of her house and starts climbing.
该视乎所需的防水料类型，各有不同的直尺长度、阔度或平方英呎，由此来计算件数。
Depending on the type of flashing required, it is estimated by the piece, linear footage with the width noted, or square feet.
现在一组经过精选可以作吉他用的玫瑰木，可以喊价到一百美金甚至更贵的价钱：但很难得体积超过一个板英呎。
Now a choice Brazilian Set for one guitar can command a hundred dollars or more: hardly a single board foot in volume.
根据先前发现的化石，古生物学家原本估计，体型最大的翼龙的翼展可能在33英呎左右，荣登有史以来最大的飞翔动物的宝座。
Based on previous fossil finds paleontologists had estimated the largest pterosaur wingspans to be around33ft making it the largest ever animal to fly.
根据先前发现的化石，古生物学家原本估计，体型最大的翼龙的翼展可能在33英呎左右，荣登有史以来最大的飞翔动物的宝座。
Based on previous fossil finds paleontologists had estimated the largest pterosaur wingspans to be around33ft making it the largest ever animal to fly.
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