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an excretory organ of certain invertebrates.是什么意思？

an excretory organ of certain invertebrates.

某些无脊椎动物的排泄器官

相关词汇
an excretory organ of certain invertebrates

an

art. 一（在元音字母前代替不定代词a），一任一某一，一个；

excretory

n. 排泄器官；adj. 排泄（物）的；

organ

n. 机构，器官，风琴，元件；

of

prep. 关于，属于…的，由…制成；aux. 助动词 [非标准用语、方言] =have [主用于虚拟语气]；

certain

adj. 某一，必然的，已确定的；pron. [动词用复数]某些；

invertebrates

n. 无脊椎动物( invertebrate的名词复数 )；
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