标记符号和电源额定值 Indentification and supply ratings
非语言传播包括信号，标记和符号。
Nonvocal communication includes signals, signs, and symbols.
非语言传播包括信号，标记和符号。
他认为，远在公元前30,000年以前，猎人可能会用一套刻在骨头和石头上的符号系统来标记月相。
He believes that as far back as 30,000 B.C., hunters may have used a system of notation, engraved on bone and stone, to mark phases of the Moon.
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