pure tone
n. 纯音, 正弦波音
例句与用法：
A unit of measure for the fineness of gold, equal to 1/24 part. Pure gold is 24 karat; gold that is 50 percent pure is 12 karat.
开测量黄金纯度的单位，等于24等分中的一分。纯金为24开; 50％纯度的黄金为12开。
pure tone
n. 纯音, 正弦波音
例句与用法：
A unit of measure for the fineness of gold, equal to 1/24 part. Pure gold is 24 karat; gold that is 50 percent pure is 12 karat.
开测量黄金纯度的单位，等于24等分中的一分。纯金为24开; 50％纯度的黄金为12开。