... always the look not thoroughly » 人类的本性是自私的，总是看不彻底 attention and learning difficulties » 注意和学习困难 a new style of bike » 一个新的自行车样式 ..
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但食物中添加的色素和防腐剂都会对孩子造成伤害，比如会使孩子无法集中注意力并出现学习困难吗？
But can the combination of colourings and preservatives added to all sorts of food harm children, making it harder for them to concentrate and to learn?
而且，我们每天还要注意学习困难，家庭事件，攀比压力，吸毒和恃强凌弱。
Plus, we're watching for learning disabilities, issues at home, peer pressure, drug abuse, and bullying.
缺乏充足的睡眠使他总是感到极度疲倦，在集中注意力和学习新事物方面困难重重，因此他整个人显得混乱而沮丧。
Because he is always extremely tired, he has trouble concentrating and learning new things. He's also unorganized and depressed because he's so tired.
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