First, read the English article below.

You want to snorkel in an area that has relatively calm waters and a vibrant mix of benign marine life. Shallow waters above coral reefs are great, as are some deeper spots best accessed by boat. Ask locals or check guidebooks to find the best spots that aren't too full of other swimmers. Even with a mask it's hard to see much underwater if the sky is dark and gloomy. Snorkel in the middle of a bright day when the water is clear of silt. Storms tend to churn up silt that clouds the water, so if it rained last night you may want to put your adventure off by a day. Seen one fish, seen them all? Not if you know what you are looking at. Memorize the shapes and colors of different kinds of fish that inhabit your local beaches and you can turn your simple swim into an aquatic zoological survey. If you see a fish you don't recognize, try to remember its patterns and look it up later. 

Now, please write a short abstract for it in Chinese. Abstract:
选对浮潜位置。 在晴朗的日子出行。 学会辨识各种鱼类和珊瑚。