Geologic studies indicate that it has been battered by multiple tsunamis, although wind, rain, and tectonic forces likely play a greater role in shaping the surface.
地质研究显示，尽管色丹岛已经历了多个海啸，但扮演地表塑造工作的更有可能是风雨和地质构造。
FIBER post: Prepare the root canal with the Pre-Shaping and Finishing drills, according to manufacturer's instructions. METAL post: Sandblast the surface of the post.
纤维桩：依照厂商说明使用预成钻和完成钻进行根管预备。金属桩：对桩的表面喷砂。
The shaping machining process is directly determined by the bonding property between base surface and the part.
成形加工过程中成形零件与基体表面的粘结牢固性直接决定加工是否可以顺利完成。
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