But Hartley 2's nucleus is definitely the smallest one so far, its longaxis spanning only about 2 kilometers (1.2 miles).
不过哈雷2号的核心毫无疑问是目前见过的最小的了,它的长轴直径仅约2千米(1.2英里)。
2
Furthermore, telescopic crowns transfer occlusal forces along the longaxis of the abutment teeth and provide guidance, support, and protection from movements that might dislodge the denture.