用常规有限元和二次动态有限元解算了一个悬臂三角形弯曲板的前六阶固有频率。
The First six natural frequencies of a cantilevered triangular bending plate are calculated both by the conventional finite element and by the second order finite dynamic element.
慢慢的弯曲你的膝盖直到你的脚板指向天花板。
Slowly bend your knees until your feet point toward the ceiling.
海登的右腿上，裤子被卷到膝盖，一块从他爸爸的举重器材上取下来的塑料板，正套在他那超级大拇趾的底端，每隔大约一秒钟的时间，他便上下伸展或弯曲一下他的大拇趾。
His right pant leg was rolled up to the knee, and on the end of his big toe was a plastic weight from his dad's weightlifting set. Every second or so, Hayden flexed his toe up, then down.
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