士兵被授予开枪的权力，但仅作为最后的手段。

Soldiers were given the authority to shoot, but only as ___a ___last ___resort.

用强迫手段让孩子同意只应是万不得已的最后手段。

Using force to make a child agree should be only ___a ___last ___resort.

在所有其他治疗方案都失败后，这项风险高的手术被视作最后的手段。

The risky surgery was considered ___a ___last ___resort after all other treatments had failed.