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）；（2）外道；（3）鼓膜。

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

，或者，是你可以看到、扭动、抓住的部分，你也可以用环装饰它。

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

如何帮助涡虫检测这些化物质的具径仍然未知。

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

令观察它们的印象深刻的是，它们在完全长出之前就恢复了这种能力。

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，但它们能够恢复感知化物质的能力。

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.

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

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， 切除了一种涡虫的，一天后， 他们发现该涡虫很难寻找食物，这表明似乎参与了涡虫的化感应过程。

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。