n.内在的气质;精神,勇气;气概;
例句:
The next race will put him on his mettle.
下次赛跑他就要全力以赴了.
Full of mettle; spirited and plucky.
行政部门 的一个有勇气的讽刺作家.
The added competition keeps them on their mettle.
加赛让他们全力以赴。