The forces acted on melting pool during plasma arc welding process are analyzed. The violent movement of liquid metal is as the result of joint forces acted on the pool.

通过对等离子弧焊接时熔池的受力情况分析，阐明了液体金属剧烈运动是由于多种力共同作用的结果。

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Rosa Parks and Martin Luther King,Junior had started a movement of non-violent protest in the South.

VOA: special.2009.03.08

Their leaders said they were a non-violent democracy movement representing poor and rural people.

VOA: special.2010.05.22

Sometimes this movement is violent and results in death and destruction.

VOA: special.2011.01.04

This maneuvering will inevitably cause the choppy, violent movement that is typical of bear raids on the stock market.

FORBES: The Only Two Concerns An Investor Should Have Currently

American policymakers need to be aware of this fact, because a government run by Bhutto or Sharif simply may not be up to the challenge of confronting this violent movement.

CENTERFORSECURITYPOLICY: Dictatorships and Double Standards

We've just marked the 50th anniversary of the Montgomery bus boycott, the beginning of the non-violent protest movement in the civil rights struggle.

NPR: History of Boycotts