n. 
直线
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externalities,
externality,
externalization,
externalize,
externally,
externally-oriented,
external-upset,
externe,
externship,
externus,
相似单词
catheterization,
catheterize,
cathetodesma,
cathetometer,
cathetron,
cathetus,
cathexis,
cathidine,
cathionone,
cathisophobis,