difficult to deal with or understand, tricky, to throw something, to cast - cast - cast, the actors in a play, the cast, able to be easily hurt, damaged, or affected, vulnerable, a sudden event causing great damage or suffering, disaster, easy to carry or move, portable, goods transported by ship, train, or truck, freight, new idea, method, or product, innovation, a device or source that provides light, illuminator, a fastening made by tying a rope or string, knot, a powered railway engine that pulls trains, locomotive, a surface or device that reflects light, reflector, to produce or create something, to generate, to show information or images, a screen, to display, disadvantage, drawback, very strong or extreme, intense, to provide with necessary tools or equipment, to equip, working well without wasting time or energy, efficient, very strict or severe, stringent, strong, rough, and able to withstand harsh conditions, rugged.

3.1 Basic definitions

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