bi-
pref 前綴 two; twice 二; 兩次: biannual
bicentenary. Cf 參看 di-, tri-. bi-, NOTE ON USAGE 用法
Note that bi- is used with certain expressions of time (eg bimonthly) to mean both `every two' (months) and `twice a' (month) 注意bi-附加在某些表示時間的詞語前面(如 bimonthly), 兼有`每兩'(月)和(每月)`兩次'兩種含義. There is a distinction between biennial (every two years) and biannual (twice a year). *biennial意為`每兩年', biannual意為`每年兩次', 這二者的區別則十分清楚.