You've probably noticed that water makes sand stick together. Then it is easy to mold. The next time you play in the sand, just think about where the sand came from. It's hard to believe it could end up making a great sand castle.

　　你大概注意到了，水能让沙子粘在一起，这样沙子就很容易被塑成各种形状。下次在海滩玩耍的时候，想想沙是怎么来的，你很难相信这个过程最终结局会是一座大沙堡。

　　Watch Shore Birds Fly 看滨鸟翱翔

　　Pelicans dive. s run. Seagulls swoop. Have you ever noticed all the birds at the beach?

　　鹈鹕一头扎入海中，矶鹞在沙滩上奔跑，海鸥从半空猛冲下来。你有没有留意过海滩上的各种鸟类呢？

　　Birds that live along the sandy shore have learned how to use both land and water. They nest on land. And they get much of their food from the ocean.

　　生活在海滩上的鸟很清楚如何同时利用陆地和大海。它们在陆地上筑巢，从大海里获取大部分食物。

　　One of the most common birds on the sandy shore is the seagull. There are many different kinds. Often you hear high-pitched cries of the gulls as they search for food. It is a sound that is as common as the crashing waves.

　　海滩上最常见的一种鸟类就是海鸥。海鸥有许多种。你常常可以听到正在捕食的海鸥发出尖厉的叫声。在海滩上，这叫声就和海浪拍岸的声音一样正常。

　　Brown pelicans are large birds with an interesting look. You've probably noticed that they have big pouches at the bottom of their beaks. The pouch acts like a scoop. When brown pelicans spot a fish in the ocean, they dive straight at it. In the water, the pelican's beak opens for the fish. Water rushes into the pouch, carrying the fish with it. The pelican quickly closes its beak. The water drains out of the pouch--but the fish is trapped. The pelican can then gobble the fish right down.

　　褐鹈鹕是一种模样有趣的大鸟。你大概已经注意到了它们的喙下面那个大大的喉囊，它的作用就像一把大勺子。褐鹈鹕一发现海里有鱼，就会一头扎进水里，把喙打开，让海水跟鱼一起冲进喉囊，然后立刻把喙闭合。水会从喉囊流出去，而喉囊中的鱼则被和鹈鹕直接吞了下去。

　　On the beach, there's so much interesting science to learn. Plus it changes every time you visit.

　　海滩上有趣的科学知识真是太多了。而且，你每一次到访，海滩就会呈现一派新的气象。