That's the interference of sound waves from the forks.

那是音叉发出的声波的干涉的结果。

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A theory analysis is made for a phenomenon of "line group" which is bell shaped, and the spectrum interference between direct path sound and reflected sound is revealed.

从理论上分析了钟型的“线谱群”的产生原因，证明了此现象是反射声和直达声之间的谱干涉引起的。

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Beside filtering interference signals and extract effective signals, it is a difficult problem to study the separation of multi-signal of sound wave and vibration.

在实际测量过程中，除了过滤干扰信号，提取有效信号外，多振动源信号分离是本文研究的一个难点。

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"We urge President Clinton to veto this legislation and preserve the ability of women and their physician to make sound medical judgement free of political interference, " acting Planned Parenthood president Jane Johnson said.

CNN: AllPolitics - Abortion Bill Passes House

O'Neill and the Bush Administration should emphatically insist that the IMF encourage its clients to operate in accordance with five basic principles: the rule of law, sound money, low taxes, minimal government interference in the setting up and running of businesses, and the removal of trade barriers.

FORBES: Fact and Comment

The principles of growth -- sound money, low taxes, the rule of law and nonbureaucratic interference in the setting up and running of businesses -- have been routinely violated, even since the fall of communism.

FORBES: Fact and Comment