I was lucky enough to be raised by a wonderful mother who, like so many heroic single mothers, never allowed my father's absence to be an excuse for me to slack off or not always do my best.
很幸运的是我有一个非常棒的母亲抚养我成长，她像许多英勇的单身母亲那样，从不允许自己以父亲的缺席作为借口而怠慢我。
That is to say, when humans evolved without a particular switch, the absence of that switch allowed the brain to grow further.
也就是说，人类在进化中丢弃了这个特殊的开关，而这个缺失的开关让大脑能发育更高级。
The study found that monarch butterflies have an internal sense of direction that allowed them to get from one point to another even in the absence of light by sensing the Earth's magnetic field.
有研究发现帝王蝶有方向感，可以让他们在没有光的情况下，通过磁场感应的方式，它们能精确的从某处飞到另一个地方。
The absence of this structure may have allowed neurons there to establish more connections with each other and work together more easily, the researchers speculated.
没有这种结构可能有允许那里的神经元共同建立更多的连接且协同工作更容易，研究人员推测。
Direction: for this part, you are allowed 30 minutes to write a composition entitled Asking for Leave of Absence.
方向：对于这一个部份，你被允许30分钟写一篇被权力要求休假的作文。
The absence of geographic boundaries allowed the client to select a therapist who appeared to have the expertise and understanding needed in the client's particular situation.
没有地理边界也允许顾客选择一个似乎有专门技术又理解顾客特殊情况需要的治疗师。
Nineth foreign teachers shall strictly obey the rules and systems of teaching. You shall work on time and there is no reason absence or changing and it is not allowed to travel in working time.
外教要严格遵守我院教学规章制度，按时出勤，不得随意缺课、调课，更不得利用教学时间外出旅行、参观和游览。
Students who have been allowed an excused absence will be asked to complete a written assignment concerning the papers discussed during the missed class session.
被允许缺课的学生会被要求完成一个关于遗漏课程上讨论的论文的书面作业。
Students who have been allowed an excused absence will be asked to complete a written assignment concerning the papers discussed during the missed class session.
被允许缺课的学生会被要求完成一个关于遗漏课程上讨论的论文的书面作业。
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