young, having lived or existed for only a short time., touch, to bring a bodily part into contact with especially so as to perceive through the tactile sense, double, consisting of two equal, identical, or similar parts or things., trouble, difficulty or problems., echo, a sound or sounds caused by the reflection of sound waves from a surface back to the listener., chemist, a person engaged in chemical research or experiments., chemical, relating to chemistry, or the interactions of substances as studied in chemistry., scene, the place where an incident in real life or fiction occurs or occurred., scenery, the natural features of a landscape considered in terms of their appearance, especially when picturesque., science, the careful study of the structure and behaviour of the physical world, especially by watching, measuring, and doing experiments., scientific, based on or characterized by the methods and principles of science.

unit 17

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