本杰明·富兰克林在1752年发现闪电实际上就是电，在他那个著名的实验中，富兰克林将一只栓有金属钥匙的风筝放飞到雷暴之中，当他看见钥匙上火花四溅时，他关于闪电的猜想得到了证实。
In his now-famous experiment, he sent a kite with a metal key tied to the string up into a thunderstorm. When he saw sparks leap from the key, his hunch about lightning was confirmed.
房颤患者需要口服抗凝药，常规应使用裸金属支架，因为裸金属支架只需双重抗栓治疗，不需要三重抗栓治疗。
In patients with atrial fibrillation on oral anticoagulants, the routine indication should be bare metal stents because bare metal stents implies double therapy not triple therapy.
方法：选择牙根分叉较大的磨牙残冠残根，经完善根管充填后，制作分体栓道式铸造桩核，然后精密铸造金属全冠修复。
Methods: The residual crown and root of large furcation molars by full root-fill were chosen. Then casting anatomy bolt post-core molars are restored with finely casting full crowns.
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