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

这 3 个部分分别：（1）耳廓；（2）外耳道；（3）鼓膜。

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

耳廓，或者耳廓，以看到、扭动、抓住的部分，也以用耳环装饰它。

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

耳廓如何帮助涡虫检测这些化学物质的具径仍然未知。

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

虽然这些蠕虫无法重新长出耳廓，但它们能够恢复感知化学物质的能力。

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

观察它们的科学家印象深刻的，它们在耳廓完全长出之前就恢复了这种能力。

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， 科学家切除了一种涡虫的耳廓，一天后， 他们发现该涡虫很难寻找食物，这表明耳廓似乎参与了涡虫的化学感应过程。

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.

这些三角形被称为耳廓，它们被认为涡虫如何对周围水中的化学信号作出反应的重要因素——例如能帮助它们向食物移动的氨基酸梯度。

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，回到我们的涡虫， 它们的耳廓被切断后， 很难找到食物，这意味着它们也有办法重新长出身的那个部分。