How to pronounce the key in A Tale of Two Cities with Lock and Key?

Lock key suǒ yuè

Lock and key. Borrow frontier defense stations and important towns. Wan Li Great Wall is the first pass (Shanhaiguan).

Note 1. Two Beijing: Since the Han and Tang Dynasties, Chang 'an and Luoyang have been called two Beijing (namely Tokyo and Xijing). This refers to Shenyang (the capital before the Qing Dynasty entered the customs, called Shengjing) and Beijing (the capital after the Qing Dynasty entered the customs).

2. The first pass: Shanhaiguan is the eastern starting point of the Great Wall of Wan Li and the most famous pass. Therefore, it is called "the first level".

Shanhaiguan began to immigrate to build a city in the first year of Yuanhe (1328), and in the fourteenth year of Hongwu in the Ming Dynasty (138 1), Shanhaiguan, also known as Shanhaiguan, began to build the Great Wall and build guards, becoming the northeast gateway to protect the capital. Therefore, it has the reputation of "the lock and key of the two capitals are unparalleled, and the Great Wall of Wan Li is the first pass"