Simmias says we can't conclude that the soul is indestructible because we should not believe the subconclusion 4 invisible things can't be destroyed.

他说我们不能得出结论说,灵魂不朽或几乎不朽或其他什么,因为我们不该相信,4这个结论4,即无形的东西不可毁灭。

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When he talks about the soul being invisible, and invisible things being indestructible, maybe he means things that can't be observed through any of your five senses.

他谈到灵魂是无形的,无形的东西不会毁灭，也许他指的无形是通过五官,都无法觉察到的东西。

耶鲁公开课 - 死亡课程节选

It won't surprise you when Plato looks for an example of something that is eternal and indestructible his mind immedialately starts thinking about the 3 platonic forms. Take the number 3.

当柏拉图寻求,某种永恒，不可毁灭的东西,作为证明例子的时候,你可能不会觉得奇怪他马上想到了,柏拉图形式，比如说数字。

耶鲁公开课 - 死亡课程节选