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。
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。
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。
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。
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