The eruption of permanent teeth have a certain amount of time and sequence.
恒牙的萌出有一定的时间和次序。
A whirlwind computer animation sequence gives you a ride through the center of the earth to see the process of the geological forces that cause a volcanic eruption of earthquake.
本片还利用电脑动画模拟地心活动，向你展示导致火山喷发和地震的地底力量的形成过程。
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