The physics teacher now sets up a transverse wave on a long elastic cord by moving her hand up and down, as shown in the diagram below.
物理学教师现在让有弹性绳子的以横向波形式上下移动，如下面的图解中所示。
The quilt cover may utilize the elastic cord ring on its four corners and fixing buckles at both sides of mattress body, realize the anti-falling off effect.
防踢被盖是利用其四角上的松紧带环与垫体两侧的固定扣相连，实现防踢效果。
The principle of selecting cord with high tenacity and low elastic modulus was proposed.
提出了帘线的选用原则：高强度，低弹性模量。
Anti-static Wrist Strap made of mix-woven with elastic material and silver conductive fiber. It has good conductivity with more comfortably, adjustable length and unbreakable ground cord.
防静电手腕带使用柔软而极有弹性的银纤维导电丝混合编织而成。此手腕带导电性、舒适性好，长度可任意调节，弹簧接地线不易断裂。
Anti-static Wrist Strap made of mix-woven with elastic material and silver conductive fiber. It has good conductivity with more comfortably, adjustable length and unbreakable ground cord.
防静电手腕带使用柔软而极有弹性的银纤维导电丝混合编织而成。此手腕带导电性、舒适性好，长度可任意调节，弹簧接地线不易断裂。
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