十万个为什么·科学阅读30篇（5）
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How Do Snails Make Their Shiny Trails?
蜗牛是怎么留下闪亮痕迹的？
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Snails make slime from special glands under their foot.蜗牛通过足部下方的特殊腺体分泌黏液。
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This sticky mucus helps them slide smoothly on surfaces.这种黏性黏液帮助它们在物体表面顺畅滑行。
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The slime keeps their soft body from drying out.黏液防止它们柔软的身体变干。
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It also protects skin from sharp rocks and hot ground.它还能保护皮肤免受尖锐石块和高温地面的伤害。
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Sunlight reflects off the wet trail, making it shine.阳光照射在湿润的痕迹上，使其闪闪发亮。
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Some snail slime even heals small cuts on their skin.有些蜗牛的黏液甚至能愈合皮肤上的小伤口。
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They leave trails to find food or return home later.它们留下痕迹以便觅食或日后返回栖息地。
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The shine fades when the slime dries in air.黏液在空气中变干后，光泽就会消失。