One limitation that applies to hubs and switches alike is that an Ethernet network must be loop-free.

集线器和交换机有同一个局限，即以太网网络必须是无路由循环的。

A: Try Loop PDF - it's a free service that lets you combine multiple documents, images and even web pages into a single PDF file.

A：你可以试试Loop PDF，他们提供免费服务，可以将多个文档、图片、甚至网页合并进一个PDF文件。

If your horse has learned how to nibble the quick-release knot and free himself, you will have to "horse-proof" the knot by dropping the tail of the rope through the loop as shown here.

如果你的马已经学会如何啃咬快松结来解放自己，你一定要把多余的绳子部分穿过绳圈来达到“马防”的作用。

This paper proposes the concept of Minimum Closed Loop of free curve set, and presents two properties of Minimum Closed Loop.

文章提出了自由曲线集最小闭环的概念，给出了最小闭环的两个性质。

A method of setting up a experimental platform of loop coordinated manipulation and motion control for double-arms free flying space robots was presented.

阐述了双臂自由飞行空间机器人闭链式协调操作运动控制实验平台的建立方法。

This paper presents a communication optimization technique, named communication-free redundant computation partitioning, for parallel loop sequences.

针对并行循环套序列，提出一种冗余计算分割的通信优化方法。

The objective was to design derivative state feedback controllers so that the closed-loop system was regular, impulse-free, and the closed-loop poles was to be placed in a given region.

考虑连续广义系统的圆形区域极点配置问题，采用微分状态反馈的方法设计控制律使得闭环系统正则，无脉冲且闭环极点位于给定的圆形区域内。

The input impedances of the double-loop antenna in free space are also calculated, and the results obtained are compared with those from transmission line transformation of ca…

还计算了自由空间的双环天线的输入阻抗，将结果和由单环的计算值经传输线变换而获得的结果作了对比。

Although he reported oversteer following the morning loop of stages, the Finn enjoyed a trouble-free afternoon.

尽管在上午的比赛中，科托马表示赛车有转向过度的问题，但是芬兰人非常享受下午零问题的比赛。

This article is the technical summarization that we developed over past two years phase-locked velocity servo loop for three-phase asynchronous motor that drives gas-dynamic free-rotor gyroscope.

本文是两年来研制动压气浮陀螺驱动马达锁相式速度控制系统的技术总结。