the discovery of Indo-European began with the workthe discovery of Indo-European began with the work of ________.2.speech sounds can be descdibed in physical or a_______ terms.

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the discovery of Indo-European began with the work
the discovery of Indo-European began with the work of ________.
2.speech sounds can be descdibed in physical or a_______ terms.


the discovery of Indo-European began with the work of ____research____.
印欧系的发现开始于调查工作.
speech sounds can be descdibed in physical or a____mental___ terms
这句单词有误,无法回答,望完善回答.
不懂继续问.

印欧语的发现起源于工作