然而，当用它的皮肤卷成皮管修复环咽缺损时，由于太臃肿会导致阻塞。
However, when the skin of it was tubed for circumferential defects, the bulk could result in obstruction.
巴纳德环太昏暗以致肉眼无法辨认。
Barnard's Loop is too faint to be identified with the unaided eye.
一个路由器有乙太网路、记号环、串列和ISDN介面，哪些介面会有MAC位址？
A router has an Ethernet, Token Ring, serial, and ISDN interface. Which interfaces will have a MAC address?
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