So the pinna, or auricle, is the part that you can see, and wiggle, and grab, or festoon with an earring.

廓，或者廓，是你可以看到、扭动、抓住部分，你也可以用环装饰它。

Its 3 parts are (1) auricle or pinna (2) external acoustic canal and (3) the tympanic membrane.

这 3 个部分分别是：（1）廓；（2）；（3）鼓膜。

The exact pathways underlying how auricles help planarians detect  these chemicals are still unknown.

状突帮助扁检测这些化学物质具体途仍然未知。

But in one paper, scientists  amputated the auricles off a planarian species, and a day later, they found that the  planarian struggled to find food, suggesting the auricles seemed to be involved  in the planarian's chemical-sensing process.

但在一篇论文中， 科学家们切除了某种扁状突，一天后他们发现扁很难找到食物，这表明状突似乎参与了扁化学感应过程。

And while these worms were not  able to regrow their auricles, they were able to regain their  ability to sense chemicals.

而这些扁虽然无法再生状突，但它们恢复了感知化学物质能力。

What was notable to the scientists observing them was that they regained this ability before  the auricles were even fully regrown.

令观察它们科学家们值得注意是，它们在状突完全再生之前就恢复了这种能力。

Those triangles are called auricles, and  they're thought to be an important factor in how planarians respond to chemical  signals in the water around them— like gradients of amino acids that  might help them move towards food.

那些三角形结构被称为状突，据认为它们是扁如何响应周围水中化学信号重要因素——比如氨基酸梯度， 这可能帮助它们向食物移动。

And of course, returning to our planarians  whose auricles had been cut off and were struggling to find food, that means they have  the means to regrow that part of their body too.

当然， 回到我们讨论那些被切掉了状突并努力寻找食物扁身上，这意味着它们也有再生那部分身体能力。