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How Do Snails Move Without Legs?
蜗牛没有腿是怎么移动的？
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Snails move using one strong, flat muscle called a foot.蜗牛靠一块强健扁平的肌肉（称为腹足）移动。
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This foot makes slow, wave-like motions from front to back.腹足从前向后做缓慢的波浪式运动。
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Glands in the foot release slimy mucus to help slide.腹足内的腺体分泌黏液，帮助滑行。
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The mucus keeps the snail’s body wet and safe from sharp rocks.黏液能保持蜗牛身体湿润，并防止被尖锐石子划伤。
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It also leaves a shiny trail behind.同时留下一条闪亮的痕迹。
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Snails can lift parts of their foot to turn left or right.蜗牛可抬起腹足的部分区域来向左或向右转向。
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They move slowly — about 0.03 miles per hour.它们移动缓慢——时速约0.03英里。
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Even without legs, their method works well for quiet life.即使没有腿，这种移动方式也十分适合安静的生活。