所以海蛤蝓吃海藻。
海藻的大部分被这种海蛤蝓消化，但是叶绿体保持完整不被消化。
The slugs digest most of the algae, but those plastids remain whole and undigested.
但是，一种不起眼的海蛤蝓竟然拥有植物那样利用太阳能的本领。
But one kind of lowly sea slug actually has the solar power abilities of a plant. Bizarre but true, the sea slug carries out photosynthesis.
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