be upon on ones mettle的用法和樣例：
例句
用作形容詞 (adj.)
- I hope she will be cheered and strengthened with aid from this side of the Atlantic.
我希望她會(huì )從大西洋此岸得到支持，使她精神奮發(fā)，堅強有力。 - There remain many courageous individuals, but they have no determining influence on public life.
當然，仍有許多勇敢?jiàn)^發(fā)的個(gè)人，但他們對社會(huì )生活沒(méi)有決定性影響。
