1 lt was also found that although she could perceive things with her fingers this ability CEASED the moment her hands were wet.

这里的CEASED后面为什么没有AT，我知道HER前面可以省略WHEN，但是前面又加个THE MOMENT这就不能理解了

2 Carl Akeley, the American naturalist, led TWO expeditions in the nineteen-twenties, and now lies buried among the animals he loved so well.

原文翻译是说他带领过“两次”探险，根据上下文应该是没有错的，可单独一个TWO为什么能说是“两次”呢？

3 Yet the fact is we know very little about gorillas. No really satisfactory photograph has ever been taken of one in a wild state, no zoologist, however intrepid, has been able to keep the animal UNDER CLOSE AND CONSTANT OBSERVATION in the dark jungles in which he lives.

我想AND前后两部分大写是分别跟KEEP的，按时间顺序是前后的 ，也就是说CONSTANT前面省略了一个KEEP，因为如果不是这样那就是KEEP THE ANIMAL CONSTANT OBESERVATION，而这样解释不通，可是这里的OBSERVATION又是个单数，前面没有冠词，奇怪，不知道我的分析对不对

欢迎大家指点，讨论，谢谢！

第一句是不是fingers后要加逗号，加了就没问题了。
第二句就不明白你的意思了，单独一个TWO为什么不能说是“两次”呢？如果不是，那该如何解释？
第三句，我认为CONSTANT是和CLOSE并列的。意为“在密切且经常不断的观察下”

不知你觉得我说的有道理吗？