I don’t know how many days I have been given to spend, but I do feel my hands are getting empty. Taking stock silently, I find that more than eight thousand days have already slid away from me. Like a drop of water from the point of a needle disappearing into the ocean, 我的日子滴在时间的流里，没有声音也没有影子。
needle n. 针；
my days are dripping into the stream of time, soundless, traceless.
1.滴落很多人用了drop into, 还有的用了flow 或是disappear都不如drip into 描述的更准确.
2.如果没有影子shadowless 应该也可以吧，回复中大多数人比较习惯用 no shadow，希望我的总结可以拓宽你翻译的思路。