If you carry more than 5000 USD or 20000 RMB in cash or equivalent foreign exchange, you need to declare it to the customs, otherwise it will be regarded as smuggling or money laundering, and you will be fined or confiscated. The watch you are carrying is a gift you bought or received by yourself, and the value is less than 5000 RMB, so you can enter the country duty-free. Those who exceed this limit need to declare to the customs and pay postal tax, otherwise they will be regarded as tax evasion or smuggling, and will be fined or confiscated. Watches belong to articles with 60% tax rate, and the excess duty-paid price is multiplied by 60% to get postal tax. If the watch is worth 6000 RMB, the postal tax to be paid is (6000-5000)x60%=600 RMB. Watches carried by others are entrusted or brought back to China. Whether it is paid or not, it is necessary to declare and pay postal tax to the customs, which may be regarded as tax evasion or smuggling, and be punished by fines or confiscation.

Transit refers to crossing national boundaries or regional administrative boundaries. Cross or cross the border.