n. a number that has no factor but itself and 1
n. the second canonical hour; about 6 a.m.
n. the time of maturity when power and vigor are greatest
v. insert a primer into (a gun, mine, or charge) preparatory to detonation or firing
n. 最佳部分, 初期, 全盛期
a. 主要的, 最初的, 根本的
v. 加油启动, 灌注, 填装