当主机端位置较偏远时，这个过程就变的更加复杂。
The process is much more complex in the case of a remote host.
检测器 可被置于远端或者近端位置，使收集的光通过光纤传送到该检测器。
The detectors may be housed distally or at a proximal location with gathered light being transmitted thereto via optical fibers.
该设备还包 含置于细长轴的至少一部分上的保护套，且可相对于细长轴在远 端位置和近端位置上移动。
The device can also include a protective sheath disposed over at least a portion of the elongate shaft and movable relative to the elongate shaft between a distal position and a proximal position.
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