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等差中项

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děng chà zhōng xiàng
arithmetical mean

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housedress, housefather, house-flannel, housefly, housefront, houseful, houseguest, househeating, household, house-hold,

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等边的, 等边三角形, 等边形, 等参的, 等差级数, 等差中项, 等磁力的, 等磁力线, 等大的, 等待,