On One's Mettle 振奋精神
be on one's mettle 鼓起勇气
be upon on one's mettle 鼓起勇气
Put One On One's Mettle 激励
One afternoon, we left the kids to test their mettle on the resort's most challenging terrain and we leisurely skied back to our cabin door.
CNN: Taking the kids: On an old-fashioned Montana ski trip
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