as keen as mustard
1. 解词释义
As keen as mustard中的mustard的意思是“强烈的兴趣”。Keen是指感情等热烈的强烈的，深刻的。那么整个短语的意思是“热衷，非常感兴趣”。要表示热衷于……，对…..非常感兴趣，在短语的后面用介词about。
2. 拓展例句
e.g. In his early years, he was as keen as mustard about basketball.
他早年热衷于打篮球。
e.g. McNamara are not as keen as mustard about the assignment.
麦克纳马拉并不热衷于自己的任务。
e.g. She was as keen as the mustard about bird-watching since she moved to London.
她自从搬到伦敦，就热衷于赏鸟。