Depending on how long you will stay here, you'd better take one or two thin coats besides short sleeves. Although the water supply festival in June 5438+065438+ 10 has passed, it won't rain again, but it will be cold in the morning and evening, so you can get sun protection when you go out. Skin care products with high sun protection and some anti-mosquito drugs (safflower oil or something). As for American dollars, you only need to change one hundred dollars in China. Don't change the whole bill. You can ask the bank to give you several 10 dollar bills and change the rest into 1 dollar bills. Wait until Cambodia finds a place to exchange money. The exchange rate here is higher than that in China. Change dollars, and then change dollars into some Cambodian coins. At present, the Cambodian currency is at least 4,000 US dollars, which can be exchanged for these denominations: R5000/1000/500/100. If appropriate, it must be US dollars, which is very common in Cambodia.