Step 1: Understand the given exchange rate
The given exchange rate is 1 USD = 6.84 CNY, which means 1 US dollar is equivalent to 6.84 Chinese yuan.

Step 2: Determine what the problem is asking for
The problem doesn't specify a particular question related to the given exchange rate、However, a common task related to exchange rates is to convert an amount from one currency to another.

Step 3: Provide a general solution based on a typical problem related to the given information
To convert USD to CNY, we multiply the amount in USD by the exchange rate (6.84 CNY/USD)、For example, to convert 100 USD to CNY, we calculate 100 * 6.84.

Step 4: Perform a sample conversion
100 USD * 6.84 CNY/USD = 684 CNY.

Step 5: State the final answer based on a specific conversion task
Since the problem doesn't specify an amount to convert, let's assume we're converting 1 USD to CNY as a basic example、The final answer for converting 1 USD to CNY is 6.84 CNY.

The final answer is: $\boxed{6.84}$