Statistical error-correction and interpolation routines will generally produce track plots to an absolute accuracy of 100 to 200 ft . 统计误差校正和内插程序，通常能以100200英尺的绝对精度绘出跟踪曲线。
It is customary to fly, so far as is feasible, at a uniform elevation above sea level but within a range of 750 to 1500 ft above the earth's surface . 在条件许可之下，一般都在海拔以上离地面750到1500英尺范围内的均匀高度上飞行。
He was a tall man, almost 6 ft 3 inches, with horn-rimmed glasses and a thick mop of blond hair, which in later years was to turn pure white . 他身材高大，约六英尺三寸，戴一副角质眼镜，长着一头淡黄浓发，这种头发老年时就会全部变白。
Install the valve bonnet . torque to 70 ft . / lbs 安装阀盖。扭矩为70英尺/磅。
Features : large dc current ( ic = 10a ) , high ft ( ft 2mhz ) 特点:直流电流大，特征频率高。
Height : 6 . 5 ft both feet should stand firmly on the ground 高度： 6 . 5尺双脚须平稳站立
The trees were planted at 20 ft intervals 这些树是每隔20英尺栽种一棵的
The trees were planted at 20 ft intervals 这些树是每隔20英尺栽种一棵的
Glide . subject glides at speed of 20 ft 滑翔术：受术者以20 ?的速度滑翔。
Fly . subject flies at speed of 90 ft 飞行术：受术者以90 ?基本速度飞行。
