invention - something that has never been made before, physics - the science of matter and energy, irrigation - giving water through pipes or channels, a flap - a thin flat piece that can go up and down, tube - a long cylinder made from plastic, metal, rubber, or glass, especially used for moving or containing liquids or gases, a pipe - a tube inside which liquid or gas flows from one place to another, retirement - the time in life after finishing work usually at 65, waves - regularly repeated up-and-down movements, theft-prevention - the act of stopping dishonestly taking something that belongs to someone else, the bottom - the lowest part of something, thief - a person who steals, flames - a stream of hot, burning gas from something on fire, a mess - something or someone that looks dirty or untidy, weird - very strange and unusual, unexpected, or not natural, bizarre - very strange and unusual, handy - useful, accidentally - not intentionally; in an unplanned way, out in left field - strange; unrelated to other things, to contradict - to disagree with; say that somebody is wrong, to design - to make; to create, to carry - to move someone or something from one place to another, to develop - to invent something or bring something into existence, to attach - to fasten or connect something, to set off - to turn on; to start, to be in good company - to be like others; to be not the only one in some situation,

Unit 20

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