arachnoid的音標是[??r??kna???]，基本翻譯是蛛網膜，速記技巧是聯想圖像：蜘蛛（arachnid）在網膜（retina）上織網。

Arachnoid這個詞來源于希臘語，意思是“蜘蛛網狀物”。它的變化形式包括其復數形式arachnoides和過去分詞arachnoidos。

相關單詞：

Arachnophobia：對蜘蛛的恐懼。

Arachnoid mater：蛛網膜。

Arachno-這個詞前綴可以表示“蜘蛛網狀物”或“蜘蛛”。

例如，arachno-cranial（蛛網狀的顱骨）和arachno-deformation（蜘蛛網狀變形）。蛛網膜在人體解剖學中扮演重要角色，它覆蓋在腦和脊髓的表面。

此外，這個詞在英語中也被用于描述某些特殊的腦膜，如弓形層（arachnoid layer），這是腦膜的一部分，它在腦和脊髓的表面形成復雜的結構。這個詞的使用反映了神經科學和解剖學的進步，使我們更深入地理解了人體的復雜結構。

常用短語：

1. arachnoid membrane 蛛網膜

2. arachnoid matter 軟腦膜

3. arachnoid villi 蛛網膜絨毛

4. arachnoiditis 蛛網膜炎

5. arachnoid space 蛛網膜下腔

6. arachnoid cell 蛛網膜細胞

7. arachnoid granulations 蛛網膜顆粒

例句：

1. The surgeon opened the arachnoid to reveal the delicate brain tissue underneath.

2. The patient experienced severe headaches, caused by arachnoiditis.

3. The arachnoid villi provide the brain with nutrients and oxygen.

4. The arachnoid membrane protects the brain from infection and trauma.

5. The arachnoid space contains cerebrospinal fluid, which cushions the brain.

6. Arachnoid cell function is crucial for maintaining the health of the brain and spinal cord.

7. Arachnoid granulations are responsible for absorbing excess cerebrospinal fluid from the brain.

英文小作文：

Title: The Arachnoid: Protector and Nourisher of the Brain

The arachnoid, a thin layer of tissue that covers the brain, plays a vital role in maintaining its health and function. It serves as a protective barrier against infection and trauma, while also providing essential nutrients and oxygen to the brain.

The arachnoid membrane, made up of delicate fibres, forms a protective layer around the brain, preventing it from external harm. It also acts as a barrier against bacteria and viruses, preventing them from entering the brain and causing infection.

The arachnoid villi, extensions of the arachnoid membrane, provide the brain with nutrients and oxygen through the cerebrospinal fluid that bathes it. This fluid, produced by the choroid plexus, nourishes the brain and cushions it against shocks and movements of the spine.

The arachnoid cells, found in the interstices of the arachnoid membrane, play a crucial role in maintaining the health of the brain and spinal cord. They regulate the flow of cerebrospinal fluid and help maintain the correct pressure within the central nervous system.

In summary, the arachnoid is a complex but essential part of the central nervous system. Its role is multifaceted, protecting the brain from harm, providing it with essential nutrients and oxygen, and maintaining its health and function.