re·ten·tiv·i·ty /ˌriˌtɛnˈtɪvəti, rɪ-/
保持力,記憶力,保磁性
Re·ten·tiv·i·ty n. The power of retaining; retentive force; as, the retentivity of a magnet.
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retentivity
n : the power of retaining liquid; "moisture retentivity of
soil" [syn: retentiveness, retention]