1. They arouse instincts which can only be dimly understood.
    对于洞穴所激起的本能冲动，人们只能有个模糊的领略。

2. They arouse instincts which can only be dimly understood.
    为什么洞空能引发人的那种探险本能，人们对此只能有一种模模糊糊的理解。

3. The medicine he had been given because of the pain from his heart attack made his eyes weak and he only dimly saw the young man in Marine Corps uniform standing outside the oxygen tent.
    老人所服用的医治心脏病的药物损害了他的视力。所以他只能模模糊糊看见一个年轻人，身穿海军陆战队军服，站在氧气帐外。

4. Nights are long in hospitals, but all through the night the young Marine sat there in the dimly-lit ward, holding the old man's hand and offering words of hope and strength.
    医院里长夜漫漫，但是年轻的海军陆战队队员整夜都坐在灯光昏暗的病房里，握着老人的手，说着充满希望与力量的话。