n. 
石壳
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four-footed,
four-force,
fourgon,
four-handed,
Fourier,
Fourier analysis,
Fourier series,
Fourierism,
fouring,
four-in-hand,
相似单词
ammonionitrometry,
ammonistion,
ammonit,
ammonite,
ammonites,
ammoniticone,
ammonium,
ammonium alum,
ammonium carbamate,
ammonium carbonate,