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The main difficulty is that the amplitude of the sley's movement necessary to allow a large enough shed would produce very large forces of acceleration and retardation if its movement were confined to a relatively small part of the pick cycle.

这样做的主要困难是，如果筘座的运动被限制在引纬循环中的较小部分，为了形成较大的梭口，筘座的动程会引起较大的加速力和减速力。

The main difficulty is that the amplitude of the sley's movement necessary to allow a large enough shed would produce very large forces of acceleration and retardation if its movement were confine d to a relatively small part of the pick cycle.

这样做的主要困难是，如果筘座的运动被限制在引纬循环中的较小部分，为了形成较大的梭口，筘座的动程会引起较大的加速力和减速力。

The advantages of a period of sley dwell, in order to increase the time available for weft insertion and thus allow a higher loom speed to be achieved, are so obvious that the possibility of including a similar feature on a shuttle loom should be considered. The main difficulty is that the amplitude of the sley's movement necessary to allow a large enough shed would produce very large forces of acceleration and retardation if its movement were confined to a relatively small part of the pick cycle.

筘座的静止时间对增加引纬时间，提高织机速度的这一优点是如此之明显，以至于应该考虑是否让有梭织机也具有类似的性能，这样做的主要困难是，如果筘座的运动被限制在引纬循环中的较小部分，为了形成较大的梭口，筘座的动程会引起较大的加速力和减速力。

The next year I did better still, for I spaded up all the land which I required, about a third of an acre, and I learned from the experience of both years, not being in the least awed by many celebrated works on husbandry, Arthur Young (10) among the rest, that if one would live simply and eat only the crop which he raised, and raise no more than he ate, and not exchange it for an insufficient quantity of more luxurious and expensive things, he would need to cultivate only a few rods of ground, and that it would be cheaper to spade up that than to use oxen to plow it, and to select a fresh spot from time to time than to manure the old, and he could do all his necessary farm work as it were with his left hand at odd hours in the summer; and thus he would not be tied to an ox, or horse, or cow, or pig, as at present.

第二年，我就干得更好了，因为我把总需要量的全部土地统统种上了，只不过一英亩的三分之一，从这两年的经验中，我发现了我没有给那些农业巨著吓倒，包括亚瑟·扬的著作在内。我发现一个人如果要简单地生活，只吃他自己收获的粮食，而且并不耕种得超过他的需要，也不无餍足地交换更奢侈、更昂贵的物品，那末他只要耕几平方杆的地就够了：用铲子比用牛耕又便宜得多；每次可更换一块新地，以免给旧地不断地施肥，而一切农场上的必要劳动，只要他夏天有空闲的时候略略做一做就够了；这样他就不会像日前的人们那样去和一头牛，或马，或母牛，或猪猡，捆绑在一起。

The next year I did better still, for I spaded up all the land which I required, about a third of an acre, and I learned from the experience of both years, not being in the least awed by many celebrated works on husbandry, Arthur Young among the rest, that if one would live simply and eat only the crop which he raised, and raise no more than he ate, and not exchange it for an insufficient quantity of more luxurious and expensive things, he would need to cultivate only a few rods of ground, and that it would be cheaper to spade up that than to use oxen to plow it, and to select a fresh spot from time to time than to manure the old, and he could do all his necessary farm work as it were with his left hand at odd hours in the summer; and thus he would not be tied to an ox, or horse, or cow, or pig, as at present.

扬的著作在内。我发现一个人如果要简单地生活，只吃他自己收获的粮食，而且并不耕种得超过他的需要，也不无餍足地交换更奢侈、更昂贵的物品，那末他只要耕几平方杆的地就够了：用铲子比用牛耕又便宜得多；每次可更换一块新地，以免给旧地不断地施肥，而一切农场上的必要劳动，只要他夏天有空闲的时候略略做一做就够了；这样他就不会像日前的人们那样去和一头牛，或马，或母牛，或猪猡，捆绑在一起。

If necessary, some of above tests will be subcontracted to other laboratory.

如有必要，上述部分项目分包至其他实验室测试

If necessary, some of above tests will be subcontracted to other laboratory

如果必要，上述部分项目分包至其他实验室测试

A space maintainer may not be necessary if the succedaneous tooth will be erupting soon.

如果替代恒牙已快萌出，就不需要间隙保持器了

You can remove the SUID or SGID permissions on a suspicious program with chmod, then restore them back if you absolutely feel it is necessary.

可以使用 chmod 删除容易引起问题程序的 SUID 或 SGID 权限，在确实必要时再恢复其设置。

For each type of testing, a necessary and sufficient condition is defined, under which a test sequence of an FSM is synchronizable. In this paper a new model—synchroniable digraph is proposed, which can judge whether there exist any synchronizable test sequence for a given specification without synchronization operation, and which can transform its nonsynchronizable test sequence to synchronizable test sequence if the answer is true. A method to judge how to add external synchronization operations in a nonsynchronizable test sequence to change it to synchroniable one is also proposed.

提出了一种新的同步测试序列生成模型——同步有向图，它可以判断一个给定的协议规格是否可以在不需要外部同步操作的情况下，产生同步测试序列；如果可以产生，则此生成模型可以将非同步测试序列转化为相应的同步测试序列；另外此生成模型还可以用来选择为测试系统增加外部同步通道的方法。

The dissecting of samples in group2 were difficult. The root of pulmonary artery and ascending aorta failed to be unfolded because fibrous tissue was tough, right and left fibrous trigone were too firm to be solved by hand. Cardiac muscle fibers couldn't be stripped along myofibrillar trajectory since they were prone to break because of their friability.

组2的心脏解剖困难，表现为纤维组织坚韧，游离肺动脉非常困难；徒手无法松解左、右纤维三角，肺动脉和主动脉根部的游离非常困难；心肌纤维坚硬、质脆，解剖时容易断离成碎块，无法沿纤维走行方向剥离。

We have battled against the odds in a province that has become increasingly violent.

我们对在一个争夺日益激烈省的可能性。