观察蜗牛 第5期

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You can spy on a snail if you move slowly and silently.Noise or a quick motion will make a snail disappear into its shell.If it hides, wait quietly as you study its gray, green, or brown spiral1 shell. Notice if it has red, purple, orange, or yellow markings.

Coming out of Its Shell As the snail comes out,first you'll see two long tentacles2,or eye- stalks3. The dark spot on top of each one is an eye. The snail can bend the eyestalks to see what's happening around it.The snail smells and feels things with a shorter pairof tentacles, called feelers4.

Moving Forward The flat, wide underside of the snail comes out last. It is called the foot, even though it doesn't look like one. Strong muscles are attached to the shell, and they move the foot. These muscles make the foot ripple5 from front to back. This pushes the snail forward.As long as there is enough water in its body to make slime6,a snail can climb almost anything.It glides forward and leaves a trail of slime.

Hunting for FoodA snail needs to be plump7 because it sleeps all winter and much of the summer. Finding food is easy. A snail eats new leaves, rotting plants, flowers, and mushrooms. As the snail eats,its long tongue moves back and forth. The tongue is covered with sharp little teeth, arranged in rows. The snail eats very fast.

Looking Closer While the snail is eating, look at its skin through a magnifying glass8.Its skin is wrinkled9 and bumpy10, but soft. Also, look at the top of the body where it connects to the shell. You will see a tiny hole, called the breathing pore11. It opens and closes slowly, letting air in and out. A loud noise will scare the snail back into its shell.Spying time is over until the snail decides to come out again.

如果你移动时慢一点儿、轻一点儿，就能对一只蜗牛观察一番了。嘈杂声和急速的移动会使蜗牛躲进它的壳里。如果它藏了起来，你可以在一边静静地等待，一边仔细观察它那灰色的、绿色的或是棕色的螺旋形外壳。要注意外壳上是否有红色、紫色、橙色或是黄色的记号。

从壳里钻出来当蜗牛从壳里往外钻的时候，你首先看到的是两根长长的触须，或者叫“眼柄”。每个眼柄顶端的黑点儿就是眼睛。蜗牛能弯曲眼柄来观察周围的情况。它用一对较短的、称作“触手”的触须去闻和感觉物体。

向前爬行 蜗牛最后露出壳的是其扁平、宽大的底部。它叫“腹足”，尽管看起来并不像足。蜗牛有强有力的肌肉与外壳相连，它们使腹足行动起来。这些肌肉使腹足如波浪般由前向后波动，从而推着蜗牛向前行。只要体内有足够的水分产生黏液，蜗牛就能爬上任何物体。蜗牛向前滑移时，身后会留下一条黏液形成的痕迹。

觅食 蜗牛必须吃得圆滚滚的，因为整个冬天和大半个夏天它都在睡觉。蜗牛很容易找到食物，它吃新鲜的叶子、腐烂的植物、花和蘑菇。蜗牛进食的时候，长长的舌头前后蠕动，上面是一排排锋利细小的牙齿，它吃东西非常快。

近距离观察蜗牛蜗牛吃东西的时候，用放大镜来观察它的皮肤，上面满是褶皱和隆起，但很柔软。此外，留意一下蜗牛身体顶部与外壳相连处。你会看到一个叫“呼吸孔”的小洞。它缓慢地一张一合，空气由此进出。响声太大会把蜗牛吓回到壳里。只要蜗牛不再次钻出来，观察也就到此为止。

注释

1．spiral n．螺旋(形)

2．tentacle n．[动]触手，触角，触须

3．eyestalkn．[动]眼柄(十足目甲壳动物的末端生有眼的可移动的柄)

4．feeler n．触角，触须

5．ripple vi．一扭一扭地动

6．slime n．(鱼、蜗牛等)的黏液

7．plump adj．(动物、植物果实)长得圆滚滚的

8．magnifying glass 放大镜

9．wrinkled adj．有皱纹的

10．bumpy adj．有肿块的，隆起的

11．pore n．毛孔，气孔