His eyes were so tired that he had difficulty focusing it.
他的眼睛累了，无法准确聚焦。
His eyes were so tired that he had difficulty focusing them.
他的眼睛累了，调节焦距困难。
A child will have difficulty focusing his or her attention, if the proprioceptive system is not fully formed or integrated yet.
如果本体感受系统没有完全形成或者仍未一体化，则孩子难以专注。
They started out in school with higher levels of aggressive and disruptive behavior and more difficulty focusing and cooperating.
他们在学校中表现出强烈的好斗，很难集中注意力与同学合作。
Symptoms of eyestrain include sore eyes and difficulty focusing, poor night vision, difficulty in focusing after concentrating on an object, headaches and sore, red inflamed and weeping eyes.
眼睛疲劳的症状包括如下：眼睛疼痛，难于集中，夜视非常差，在注视一个物体后重新集中视线很困难，头痛，眼睛发红、疼痛、感染、流泪。
One difficulty with direct methods is that the designer spends a great deal of time focusing on the velocity distribution; the geometry is secondary.
一个直接的方法就是难度设计者花费大量的时间专注于速度分布；几何为辅。
Instead of focusing on the difficulty of a large task, break it into smaller jobs and create a timeline for finishing them.
不要关注一项大任务有多困难，把大任务分割为更小的任务，并制定完成时间表。
It is a difficulty in the design of architectural acoustics all the time that spherical conformation creates sound focusing.
球形构造声聚焦问题始终是建筑声学设计中的一个难点。
If you have difficulty feeling your emotions, start by focusing attention on the inner energy field of your body. Feel the body from within.
如果你很难感受到自己的情绪，可以先试着把注意力放在身体的内在能量场上，从内在感受你的身体。
Because of the noise outside, Nancy had great difficulty in focusing on her experiment.
因为外面的噪音，Nancy很难集中注意力在实验上。
Because of the noise outside, Nancy had great difficulty in focusing on her experiment.
因为外面的噪音，Nancy很难集中注意力在实验上。
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