glitter - very small glittering objects used for decoration  闪光装饰物

　

Algebra - a branch of mathematics in which signs and letters are used to represent numbers and values  代数学

　

turn - a place or appointed time in a fixed order, that gives one the chance or duty to do something  轮到的机会

　

back-up - a copy of information that is held on computer, which is stored separately from the computer 备份

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