even if you can still buy the book online.

即使你在网上买了这本书
This portal you came through this morning.

你们今早走过的这扇门
It says "Erected 1921".

上面写着"建于1921"
But here's the same place, in 1923,

但同一地方在1923
when the building was dedicated,

这幢建筑落成典礼上
and you notice those plaques weren't carved yet.

你们看到的这些饰板都还没雕刻
It didn't say erected 1921.

它原来写的并不是建于1921
It didn't say erected in 1921

也没有标明建立于1921年
They were still finishing the building at the time

美国化学学会在这里举行国家会议
the American Chemical Society had their national meeting here

以庆祝最大的化学学术机构落成时
to celebrate the biggest academic building for chemistry in the world.

它还在即将完工的阶段
So the slates were clean.

因此石板是空白的