expansionn.
英 ɪk'spænʃ(ə)n; ek- | 美 ɪk'spænʃən
中文n. 膨胀；阐述；扩张物
词根词源
expansion (n.)1610s, "anything spread out;" 1640s, "act of expanding," from French expansion, from Late Latin expansionem (nominative expansio) "a spreading out," noun of action from past participle stem of Latin expandere "to spread out" (see expand).
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