at the cost of造句

The lessons learned at the cost of blood helped to sober us.
血的教训使我们的头脑清醒了.

We must cherish experience acquired at the cost of blood.
我们必须珍惜用鲜血换来的经验.

He rescued the boy from drowning at the cost of his own life.
他救这小孩免于淹死却牺牲了自己的生命.

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