Similar growing conditions all along the Fujian coast make this the treasure chest for China's tea, the heart of an industry dating back almost 4,000 years.
福建沿海一带的类似种植环境使得中国茶叶独享其尊，其茶产业远可源自4000多年前。
One of the most traditional tea-growing cultures in the area is that of the Kejia people.
沿这个地区最传统的茶树栽培文化当数这里的客家人沿袭的
Every morning, goats are let loose among the tea terraces, a centuries-old tradition.
每天清晨，山羊被放养在这些茶树梯田间，这是个历史悠久的传统。

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重点讲解：

1. date back

追溯（到）；开始（于）；始造（或建）（于）；

eg. Some date back many centuries, but others have more recent origins.

有些节日要追溯到好几个世纪前，但也有一些源于近代。

eg. These plant fossils date back to the age of the dinosaurs.

这些植物化石可追溯至恐龙时代。

2. be let loose

放任；给予完全的自由；
eg. She has all the glee of a little girl let loose in a sweetie shop.

她像糖果店里无人管束的小女孩那样兴高采烈。

eg. Trainees go through a four-hour lesson before they are let loose on the controls.

受训人员须上4小时的课才能自由进行操作。