refresher
/rɪˈfreʃə(r)/noun
1- a thing that refreshes, in particular使恢复活力的事物, 尤指：
1.1
- usu. as modifier an activity that revises or updates one's skills or knowledge进修, 更新（技术或知识的）活动：
candidates take some refresher training before coming back.
应试者参加进修训练后再来。
1.2
- dated a drink〈旧〉饮料。
1.3
- Law, Brit. an extra fee payable to counsel in a prolonged case【律】〈英〉（因诉讼延长而补给律师的）额外讼费.