First, read the English article below.

If you've never exchanged currency before, it's a good idea for you to understand a bit about the process so that you don't get any expensive surprises. The general idea is that you'll find a business that exchanges currency, and they'll give you the currency that you want in exchange for a small fee (plus, obviously, the amount of money you want changed). Now, in addition to this, it's important to understand that some currencies are worth more than others. For example, one euro is usually equivalent to US$1.11 or ₤.92 GBP. How much the difference is will fluctuate, usually with the state of those economies. So, even though you're exchanging $100, you may only get out €75.  Your goal, then, is to exchange currency when your currency is high and the foreign currency is low, because this means that you'll get more of the foreign money than you would otherwise. Understand that the dollar (for example) being worth less than the euro doesn't have much to do with the cost of items. The relative cost of items is determined by the market in that area. So, for example, a banana in the US is much cheaper than a banana in Sweden, even though the dollar is strong compared to krona. The ideal ratio told by multiple Pro travelers is 80:20 ( the famous Pareto principle ). Buy 20% in cash and 80% in Forex card. It is important to exchange some money before you leave for your trip. You’ll probably encounter the advice that it’s better to exchange currency in the country you’re traveling to and that’s usually true if you are exploring common countries. However, if its a relatively off the chart country, then you may not want to follow this advice. To understand this, you must know that there are two kinds of currencies; one is those who get highly traded, Like Euro, USD, etc. The other is less traded ones, also known as Exotic currencies. Its always better to buy Exotic currency at the location but exchanging it with USD (because USD is a strong currency). However, you will want to have some cash prepared for when you arrive.... 

Now, please write a short abstract for it in Chinese. Abstract:
了解兑换流程，获取最大利益。 出发前先换一些当地货币。 注意汇率波动情况。 去银行兑换。 开一个方便在海外提款的账户。 在线购买现金。