rapidityn.
英 rə'pɪdɪtɪ | 美 rə'pɪdəti
中文n. 迅速，急速；速度；险峻
词根词源
rapidity (n.)1650s, from French rapidité and directly from Latin rapiditatem (nominative rapiditas) "swiftness, rapidity, velocity," from rapidus "hasty, swift, rapid" (see rapid).
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