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question		réponse
To flail commencer à apprendre		to move energetically in an uncontrolled way
Curve commencer à apprendre		a line that bends continuously and has no straight parts
Flat commencer à apprendre		level and smooth, with no curved, high, or hollow parts
To harness commencer à apprendre		to control something, usually in order to use its power
Dense commencer à apprendre		having parts that are close together so that it is difficult to go or see through
Lift commencer à apprendre		the force on the wing of a bird or aircraft that keeps it in the air as it moves forward
Blade commencer à apprendre		the flat part on a knife or similar tool or weapon, with a very thin edge used for cutting / a wide, flat part on a tool or machine, used to push backwater or air
To hover commencer à apprendre		to stay in one place in the air, usually by moving the wings quickly:
Upside down commencer à apprendre		having the part that is usually at the top turned to be at the bottom
To spin commencer à apprendre		to (cause to) turn around and around, especially fast
Sizeable commencer à apprendre		large
Congested commencer à apprendre		too blocked or crowded and causing difficulties
Vital commencer à apprendre		necessary for the successor continued existence of something; extremely important

Helicopters