Pottery inscribed with ink is called ostracon. This ostracon was found in the oldest Judean city unearthed to date. Archaeologists say the city is near what David killed Goliath.
油墨刻字的陶器叫

腊陶器碎片。
陶片
迄今出土的
朱迪

发现。考
学家说
靠近大卫杀死哥利
的地方。
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Pythagoras, a Greek philosopher who lived around 500BC, is said to have discovered that notes that sound harmonious together have simple ratios between their frequencies: for example, one that is an octave higher than another has double the frequency.
说公元前500年左右,希腊哲学家毕达哥拉斯已经发现了发音和谐的音符在频率之间成简单比例:例如,高
个八度的音符具有两倍的频率。