N the speed of an aircraft relative to the ground (飞机)对地速率 → compare airspeed
The carbon-fiber aircraft reached a maximum speed of 68 knots (groundspeed).
碳纤维飞机达到了68节（地面速度）的最大速度。
He glanced at the screen, typed “vitesse au sol” into The French king, and held it up for me to see the Chinese: “Groundspeed.”
他扫了一眼，将“vitesse au sol”输入了法语王，然后将它递给我看中文：“地速。”
The carbon-fiber aircraft reached a maximum speed of 68 knots (groundspeed), an average speed of 23 knots and a maximum altitude of 8, 564 metersabove sea level, a statement said.
有评论说，这架碳纤维的飞行器最高速度达到68节（水平速度），平均速度为23节，飞行高度最高为海拔8546米。
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