Hughes说，这款iPad2的正面镶嵌了一颗重750产自加拿大的班彩石，这种石头拥有7千5百万年的历史，是世界上最古老的石头。
Hughes said that the front of the iPad had been crafted out of 750 grams of Ammolite stone sourced from Canada. The 75 million year old stone is the oldest stone the world has to offer.
以班多面板堆石坝为例，用有限元方法计算了当面板缝局部失效时各种工况下的渗流场，系统分析了大坝在面板垂直缝局部失效后的稳定渗流场的规律和特点。
The seepage field and stability of concrete-faced rockfill dam in Banduo Hydropower Project, when vertical joint inactivation are occurred to the face plate, are calculated by FEM method.
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