But it does have to be produced from at least 51 percent corn and be aged in unused charred oak barrels.

但它必须由至少 51% 的玉米制成，并在未使用过的烧焦橡木桶中陈酿。

First of all, their bourbon has to be aged in new charred white oak barrels which can spend 10 years or more in buildings called rack houses like these.

首先，他们的波旁威士忌必须在新烧焦的白橡木桶中陈酿，这些橡木桶可以在像这样的称为架屋的建筑物中陈酿 10 年或更长时间。