- arithmetic sequencen.等差数列;
- arithmetic progression sequence算术级数
- arithmetic progression算术级数，等差级数;
- arithmetic meann.算术中项，算术平均;
- decimal systemn.十进制;
- decimal scale十进位制;
- decimal pointn.小数点;
- decimal places小数点
- decimal fractionn.小数;
- decimal format十进格式;
- decimal pointsn.小数点( decimal point的名词复数 );
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