ambulacral的音標是[?m"bju?l?k?r?l]，翻譯為“蔓足的；蔓足的附屬器”。

速記技巧：這個單詞中包含的字母可以簡化記憶，如“ambulacrum”可以聯想到“蔓足”，“ral”可以聯想到“related to（與……相關）”。通過聯想記憶，可以更快地拼寫和記憶單詞。

Ambulacral這個詞源自拉丁語，意為“行走的”，它來源于ambulare這個詞，這個詞的意思是“行走，散步”。

這個詞的變化形式有：過去式是ambulavi，過去分詞是ambulatus，現在分詞是ambulacral，形容詞是ambulacral-。

相關單詞有：

1. ambulance（救護車）：這個詞是由ambulacrum（意為“救護場所”）和-ce（表示名詞）組成的。它通常用來指代用于緊急醫療服務的車輛。

2. ambulacrum（救護場所）：這個詞的意思是救護車停放的地方，它來源于ambulacrum，表示救護車停放的地方。

3. ambulacy（救護隊）：這個詞是由ambulans（意為“行走”）和-cy（表示名詞）組成的。它通常用來指代由志愿者組成的救護隊。

以上這些單詞都與“行走”這個概念有關，也與醫療和緊急服務有關。這些單詞在英語中廣泛使用，并被用來描述與醫療和緊急服務相關的各種概念和場景。

ambulacral常用短語：

1. ambulacral system：蔓足類蔓足類蔓足類系統

例句：The ambulacral system of the shell is a typical example of the coelom in molluscs.

2. ambulacral groove：蔓足類蔓足類蔓足類凹溝

例句：The ambulacral groove is a typical example of the coelom in molluscs.

3. ambulacral tube：蔓足類蔓足類蔓足類管

例句：The ambulacral tube is a typical example of the coelom in annelids.

英文小作文：

Coelom is a common feature of animals, and it is found in many different types of animals, including humans. However, it is also found in some marine invertebrates, such as the marine snail, and it is particularly prominent in some marine worms, known as the marine annelids. One type of annelid that is particularly interesting is the marine worm known as the "ambulacra".

The ambulacra are long, thin worms that have a unique structure that allows them to move through the sand quickly and efficiently. They have a series of long, thin tubes that run along their body, and these tubes are connected to each other by a series of small pores that allow oxygen and nutrients to pass through. This unique structure allows the ambulacra to move quickly and efficiently through the sand, and it also allows them to survive in very harsh environments.

In conclusion, the ambulacra are an interesting type of marine worm that have a unique structure that allows them to move quickly and efficiently through the sand. Their coelom system provides them with oxygen and nutrients that they need to survive in such harsh environments.