某种外来冲击。
If found, such bottlenecks would indicate an external shock to the ecosystem.
如果找到，这个瓶颈现象就意味着当时的生态环境曾受到一种来自外界的强大冲击。
Advantages: bright colors, anti-aging, corrosion resistance, flat surface, strong tension, less vulnerable to external shock deformation.
产品优点：色彩鲜亮，抗老化，耐腐蚀，网面平整，强力张紧，不易受外力撞击变形。
We have studied the character of the motion of the torsion pendulum, and discussed how torsion pendulum responds to external shock and how the period of the torsion pendulum is changed.
我们对扭秤的运动特性进行了深入的研究，讨论了扭秤对外界冲击的响应和扭秤的运动周期是如何改变的。
We have studied the character of the motion of the torsion pendulum, and discussed how torsion pendulum responds to external shock and how the period of the torsion pendulum is changed.
我们对扭秤的运动特性进行了深入的研究，讨论了扭秤对外界冲击的响应和扭秤的运动周期是如何改变的。
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