1. It is a strange thought, but I believe a correct one, that twenty or thirty pages of ideas and information would be capable of turning the present-day world upside down, or even destroying it.
    这是个离奇的想法。不过我认为这个想法是正确的。

2. For reliable information about present national boundaries, consult an up-to-date atlas.
    要得到现今国家边界的可靠知识，查阅一下最新地图。

3. For a fleeting second, I felt it was present in my mother's room.
    有一刹那我感到这条龙就在我妈妈的房间里。

4. Fatigue and poor performance may begin to appear in the second stage of deficiency, when not enough iron is present to form the molecules of blood protein that transport oxygen to the working muscles.
    到了缺铁的第二阶段，就会出现疲倦和力不从心，此时体内已没有足够的铁来形成血蛋白分子，将氧输至运动着的肌肉。