drone – n. an unmanned aircraft or ship guided by remote control or onboard computers

guarantee – v. to promise a result; to promise that

something will happen

radiation – n. waves of energy from something that produces

heat or light; energy from a nuclear substance, which can be dangerous

sensor – n. a device that detects or senses heat, light, sound, motion, etc., and then reacts to it in a particular way

stability – n. the quality or state of something that is not easily changed or likely to change