Having learned to separate sounds from their referents, humans now learned to separate them from the speaker as well and consequently made them even more portable.
人类在学会把声音和它们所指的对象分离开以后，现在又学会了把声音同发出声音的人也分离开来，从而使这些声音更便于镌带。
Having learned to separate sounds from their referents, humans now learned to separate them from the speaker as well and consequently made them even more portable.
人类在学会把声音和它们所指的对象分离开以后，现在又学会了把声音同发出声音的人也分离开来，从而使这些声音更便于镌带。
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