Level 4 - 4 - Spelling Practices

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(1) n. [污染,玷污] contamination; undesirable state of the natural environment being contaminated

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(2) a. [有用的,经验的,实践证明的] based on experience; useful

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(3) n. [要求,自命,自称,自负] advancing of a claim; assertion; a false or unsupportable quality

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(4) n. [蛋白质] any of a large group of nitrogenous organic compounds that are essential constituents of living cells

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(5) n. [坚定,决心,决定] determination; resolving to do something; a formal statement of a decision

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(6) n. [决定,会议的正式文件,投票产生的决议] determination; formal expression by a meeting; agreed to by a vote

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(7) n. [革命] act of revolving; motion of a body around a fixed point or line; total or radical change in political organization

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(8) n. [竞争,敌对状态] competition; the act of competing as for a profit or a prize

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(9) n. [螺丝起子] a hand tool for driving screws

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(10) n. [水中呼吸器] a device that lets divers breathe underwater