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1·And, as soon as he reaches years of discretion, he is the sole judge of the proper means of preserving himself, and consequently becomes his own master.

一旦成长到了能够自主做出决定的年龄，对于采用何种手段来保全自身而言，他自己是独一无二的裁决者，因而他从此成为自己的主人。

2·I don't see that you can altogether blame the lad for being deceived by a fellow who has cheated many a man far older than he is. After all, he has barely reached the years of discretion.

我不明白你怎么能够完全责怪孩子上那个家伙的当，许多比他大得多的人尚且受那个家伙的骗，何况他还只是刚到懂事的年龄呢！

3·At 2 years, physicians should seriously consider discontinuing bisphosphonates in patients with responsive or stable disease, but further use is at the discretion of the treating physician.

在2年中，医师应认真考虑停止响应或与双磷酸盐类药物的病人病情稳定，但继续使用在治疗医生自行决定。

4·My sister, though many years younger than I, is at least old enough to be at the age of discretion.

尽管舍妹比我年轻得多，她至少也到了明辨是非的岁数。