as keen as mustard
非常热衷、充满热情
口语·形容非常热衷
英文释义
to be very enthusiastic or eager about something
例句
The new intern is as keen as mustard, always volunteering for extra tasks.
典故来源
源自19世纪英国，芥末味道辛辣刺激，比喻人的热情和积极性像芥末一样强烈，常见于口语。