碱土器与瓦器不洁之律相同，玻璃何以不列其中？因它破了还能重铸，故比同金属器。
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——它们就不该从外面染不洁。
they should not become impure from their outer side.
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那么我们在密释纳里所学的那一条，又是为什么呢？
Why, then, did we learn this in a mishna?
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瓦器与 碱土 所造的器皿，论不洁的 哈拉哈 相同：不洁之源进了它们的空处，它们便成不洁；既成不洁，凡进它们空处的食物也从那空处染了不洁。
With regard to earthenware vessels and vessels made from natron [neter], the halakhot of their impurity are equal in that they become impure if a primary source of impurity enters their airspace, and, once impure, they render food that enters their airspace impure from their air space.
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它们从背面也染不洁——就是不洁之源进了器底那有空处、可盛物的地方，那器便成不洁。
And they become impure from behind, i.e., if a primary source of impurity enters into the bottom of the vessel, where there is an empty space and a receptacle, the vessel becomes impure.
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但瓦器不从外面染不洁——就是不洁之源沾着器的外面，器里头并不因此成为不洁。
However, earthenware vessels do not become impure from their outer side, i.e., if a primary source of impurity came into contact with the outer side of the vessel, the inside of the vessel does not become impure.
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瓦器一破便洁净了。
And the breaking of earthenware vessels renders them pure.
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由此可推：惟独 碱土 之器与瓦器，论不洁之律相同，身分也相同。
By inference, specifically natron vessels and earthenware vessels are those whose halakhot of impurity are equal, as is their status.
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至于别样东西，就不是这样了。
However, with regard to other matters that is not the case.
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那么，玻璃器何以不与这几样列在一处呢？
Why, then, were glass vessels not listed together with those vessels?
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革玛拉 答：因为玻璃器破了还能修复——玻璃可以熔了重铸成新器——所以众贤把它比作同样可熔可铸的金属器。
The Gemara answers: Since if the glass vessels broke they have the capacity to be repaired, as the glass can be liquefied and recast into a new vessel, the Sages equated them to metal vessels that can also be liquefied and recast.