And so this is another lithographic milestone here that's helped to preserve it.

因此，这是另一个有助于保存它的平版印刷里程碑。

ICC does buy US made steel but says imports bridge a gap in supply for high-grade tinplated steel needed for blemish-free lithographic printing.

立金属罐头公司确实购买了美国产生的钢铁，但时也表示，进口可以弥补镀锡钢的供应缺口，镀锡钢正是无瑕疵平版印刷所需要的原材料。

And what we see is extremely regular thin beds that extend for kilometers and exceptional preservation of soft-bodied material in what's called lithographic siltstone.

我们看到的是极其规则的薄层，绵延数公里，并且在所谓的平版粉砂岩中保存了特殊的软体材料。